https://iter01.com/475022.html
https://blog.csdn.net/dQCFKyQDXYm3F8rB0/article/details/100839899
https://google.github.io/mediapipe/solutions/hands
http://www.python88.com/topic/40281
https://google.github.io/mediapipe/getting_started/python.html
https://google.github.io/mediapipe/solutions/face_detection#python-solution-api
https://google.github.io/mediapipe/solutions/hands#python-solution-api