check off mac support and add demo notes

README.md

@@ -76,7 +76,8 @@ house cleaning:
 features:
 - more stable edges for person segmentation
 - zoom support
-- MacOS and Windows support?
+- [x] MacOS support
+- Windows support?
 - convert/migrate env variables to cli arguments
 
 bugs:

demo-notes.md

@@ -0,0 +1,8 @@
+1. clone https://github.com/hamidzr/webcam-mods
+2. setup dependencies:
+  1. virtual webcam device. `v4l2-ctl --list-devices`. README
+    instructions here https://github.com/letmaik/pyvirtualcam#supported-virtual-cameras
+  2. python
+  3. input device
+3. select webcam source, otherwise the first detected webcam would be used.
+4. quick demo: crop-cam and interactive control