Apple Mac Webcam Camera not working? Here is a Quick Fix

I had to take a urgent video call today on my Mac and at the last moment found that my built in webcam was not working. In the browser, the video plugin to display the webcam feed was showing "Camera not found" and in other programs like Skype the video webcam feed was just showing a black screen.

Seems a restart would fix it (based on my reading online) but I had to fix it quicker and didn't want to restart the machine as I had some tasks running which I could not stop. I then found this below command which fixed it immediately. 

sudo killall VDCAssistant

Just open your "terminal" and type that and hit enter (you will have to enter your admin password).

Hopefully that will fix it for you too!