Tested on python 3.6.9 with the following packages installed:

opencv-python==3.4.2.17
numpy==1.18.3

Run the following command

python3 camera.py

To use background removal (using a false background), set (Line 258)

mode = 'remove'

For background blurring, set

mode = 'blur'

For neither of them (raw camera output), set

mode = None

For best results, sit in a well lit area, with a plain background, and uncover your face.