It is  in dlclivegui.py
Use OpencV to identify another target
    def display_frame(self):
        """ Display a frame in display window
        """
        x=0
        y=0
        if self.cam_pose_proc and self.display_window:
            frame = self.cam_pose_proc.get_display_frame()
            if frame is not None:
                img = Image.fromarray(frame)
                if frame.ndim == 3:
                    b, g, r = img.split()
                    img = Image.merge("RGB", (b, g, r))
             ############################################################################## another object
                    img_z=cv2.cvtColor(numpy.asarray(img),cv2.COLOR_RGB2BGR)
                    img_hsv = cv2.cvtColor(img_z, cv2.COLOR_BGR2HSV)
                    mask_blue = cv2.inRange(img_hsv, lower_blue, higher_blue)  
                    mask_blue = cv2.medianBlur(mask_blue, 3)  
                    contoursji, hierarchy2 = cv2.findContours(mask_blue, cv2.RETR_EXTERNAL, cv2.CHAIN_APPROX_NONE)  
                    
                    for e in contoursji:
                        perimeter2 = cv2.arcLength(e,True)
                        if perimeter2 > 0:
                            p,q,m,n = cv2.boundingRect(e)
                            center2=(int(p+m/2),int(q+n/2))
                            x=center2[0]
                            # print("xxxx",self.x)
                            y=center2[1]
                            # print("yyyy",self.y)
                            pts2.appendleft(center2)
                        else:
                            center2=(0,0)
                #########################################################            
                pose = (
                    self.cam_pose_proc.get_display_pose()
                    if self.display_keypoints.get()
                    else None
                )
                if pose is not None:                                  
                    im_size = (frame.shape[1], frame.shape[0])
                    if not self.display_colors:
                        self.set_display_colors(pose.shape[0])
                    img_draw = ImageDraw.Draw(img)

                    x1=pose[0,0]
                    y1=pose[0,1] 
                    # x2=pose[2,0]
                    # y2=pose[2,1]
                    center1=(int(x1),int(y1))
                    # center2=(int(x2),int(y2))
                    pts.appendleft(center1)
                    # pts2.appendleft(center2)
 
                    for i in range(pose.shape[0]):
                        if pose[i, 2] > self.display_lik_thresh:
                            try:
                                x0 = (
                                    pose[i, 0] - self.display_radius
                                    if pose[i, 0] - self.display_radius > 0
                                    else 0
                                )
                                x1 = (
                                    pose[i, 0] + self.display_radius
                                    if pose[i, 0] + self.display_radius < im_size[1]
                                    else im_size[1]
                                )
                                y0 = (
                                    pose[i, 1] - self.display_radius
                                    if pose[i, 1] - self.display_radius > 0
                                    else 0
                                )
                                y1 = (
                                    pose[i, 1] + self.display_radius
                                    if pose[i, 1] + self.display_radius < im_size[0]
                                    else im_size[0]
                                )
                                coords = [x0, y0, x1, y1]
                                img_draw.ellipse(
                                    coords,
                                    fill=self.display_colors[i],
                                    outline=self.display_colors[i],
                                )
                                # img_draw.text((200,200),'ceshi',fill=(255,0,0))
                                # img_draw.line([(pose[0,0],pose[0,1]),(320,240)],fill=0,width=10)
                                for k in range(1,len(pts)):
                                    if pts[k-1]is None or pts[k]is None:
                                        continue
                                    img_draw.line([(pts[k - 1]), (pts[k])] ,fill=0,width=2)
                                
                                for j in range(1,len(pts2)):
                                    if pts2[j-1]is None or pts2[j]is None:
                                        continue
                                    img_draw.line([(pts2[j - 1]), (pts2[j])] ,fill=180,width=2)
                                    
                            except Exception as e:
                                print(e)
          
                imgtk = ImageTk.PhotoImage(image=img)
                self.display_frame_label.imgtk = imgtk
                self.display_frame_label.configure(image=imgtk)
                
            self.display_frame_label.after(10,self.display_frame)  
        print("insidexy",x,y)
        return x,y




Processor:
Custom calling functions in Process

 def process(self, pose, **kwargs):

        if not self.hasgui:
            self.gui=DLCLiveGUI()
            self.hasgui=True
            # print("opqrst")
        y=self.gui.display_frame()
        # print("abcdeg")
        print("outsidex",y)



Some result:
insidexy 340 101
insidexy 340 101
insidexy 0 0
outsidex (0, 0)
insidexy 340 101
insidexy 340 101
insidexy 0 0
outsidex (0, 0)
insidexy 340 101
insidexy 340 101
insidexy 0 0
outsidex (0, 0)
insidexy 340 101
insidexy 340 101
insidexy 340 101
insidexy 0 0
outsidex (0, 0)
insidexy 340 101
insidexy 340 101
insidexy 340 101
insidexy 0 0
outsidex (0, 0)
insidexy 340 101
insidexy 340 101
insidexy 0 0
outsidex (0, 0)
insidexy 340 101
insidexy 340 101
insidexy 0 0
outsidex (0, 0)
insidexy 340 101
insidexy 340 101
insidexy 340 101
insidexy 0 0
outsidex (0, 0)
insidexy 340 101
insidexy 340 101
insidexy 0 0
outsidex (0, 0)
insidexy 340 101
insidexy 340 101
insidexy 0 0
outsidex (0, 0)
insidexy 340 101
insidexy 0 0
outsidex (0, 0)