Add demo tracking keypoints and bounding boxes using OpenPose and YOLOv5

demos/keypoints_bounding_boxes/README.md

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+# Track multiple classes
+
+An example of how to use Norfair to track objects from multiple classes using both keypoints and bounding boxes. This example is based on [OpenPose](https://github.com/CMU-Perceptual-Computing-Lab/openpose) version 1.7 and [YOLOv5-pip](https://github.com/fcakyon/yolov5-pip).
+
+## Instructions
+
+1. Install YOLOv5 with `pip install yolov5`.
+2. Install Norfair with `pip install norfair[video]`.
+3. Install [OpenPose version 1.7](https://github.com/CMU-Perceptual-Computing-Lab/openpose/releases/tag/v1.7.0). You can follow [this](./install_openpose.ipynb) instructions to install and compile OpenPose.
+4. Run `python keypoints_bounding_boxes_demo.py production_ID_4791196_10s.mp4 --classes 1 2 3 5 --track_points bbox --conf_thres 0.4`.
+
+Alternatively the example can be executed entirely within `keypoints_bounding_boxes_demo.ipynb`.
+
+[![Open In Colab](https://colab.research.google.com/assets/colab-badge.svg)](https://colab.research.google.com/github/tryolabs/norfair/blob/demo-keypoints-bboxes/demos/keypoints_bounding_boxes/keypoints_bounding_boxes_demo.ipynb)
+
+## Explanation
+
+This example aims to show the possibilities that Norfair offers to track objects from multiple classes using a single `Tracker` instance. Also the example shows Norfair's ability to draw keypoints and bounding boxes for different types of objects.
+
+![keypoints_bounding_boxes_demo](../../docs/keypoints_bounding_boxes_demo.gif)