If your camera doesn’t work
One of these solutions might help:
Quit FaceTime, then open FaceTime again.
Restart your MacBook - menu - Restart
Make sure that FaceTime isn't open, then see if your camera works in another application, such as Photo Booth. If it doesn't, you know that the issue isn't related to FaceTime.
in this video I've explained 2 methods
1st one is SMC- (left option+command+P+R) press and hold together after pressing power button.
2nd one is terminal command- sudo killall VDCAssistant
another command is - sudo killall AppleCameraAssistant
#fixmacbookcamera
#macfacetimenotworking
@MP WorLD