A place to post something that I learned.
Counting fingers (file opencv06.py) To run the program, you need to install some tools and package. Folder img finger. Finding and contacting with it: down hand.py and past in the same location with your main. Open camera (cv2): pip install cv2. To dir folder img fingers: pip intall os.
Adjusting volume (file opencv07.py) To run the program, you need to install some tools and package. Open camera (cv2): pip install cv2. Finding and contacting with it: down hand.py and past in the same location with your main. (numpy): pip install numpy. To manipulation with computer devices: you can search install pycaw.