added python code for tracking hand on webcamera videofeed

[joakimeriksson]

I did a quick web-camera hand-tracking example for the hand tracking code. This makes it possible to test the tracker without Jupyter notebooks.

I also did a small fix to get the correct number of values of the return statement when no hands are found.

[wolterlw]

I would suggest you follow the general best practices and put keypoint and box drawing code into separate functions and then capture the webcam and call the main while loop inside
if __name__ == ‘__main__’:
Otherwise thanks for the contribution.

[joakimeriksson]

I cleaned up the code a bit now. I will also very likely use your contribution in a project where I would like to have some of the MediaPipe trackers and you did a great job of making that easy to do - thanks!

[joakimeriksson]

Ping!