VDCAssistant and AppleCameraAssistant are crucial background process that accelerates and helps the inbuilt camera of MacBook to work. Using the Terminal app, you can kill the camera and once you do, all the camera applications like Skype, or Mac’s camera itself, turns off for once.Launch the Terminal app, from the Spotlight search (cmd+space).Type the following code in Terminal app,sudo killall VDCAssistant and hit return.If asked then enter the password.Similarly, type,sudo killall AppleCameraAssistant and press return key.Now, try to use MacBook Pro Camera and check if the problem still persists.