pip install opencv-python

On line 114, in the mousemove(mousex,mousey) function change the mousex multiplier to your (screenwidth divided by 500). Change the mousey multiplier is your (screen height divided by 500).

python controlmouse.py

wait a few seconds for the camera to load...

Press b when you're out of the frame to set the background

Press r to reset the background

Background subtraction method: Gaussian Mixture-based Background/Foreground Segmentation Algorithm