У вашего броузера проблема в совместимости с HTML5
In this video, we’re going to use Python and the OpenCV2 library to do body tracking!
Contouring option: https://www.bluetin.io/opencv/object-detection-tracking-opencv-python/
Edit: Here is the original code. In hindsight it is inefficient, many changes need to be made to optimize. https://github.com/Its-Triggy/Joint_Track