Method 1: Force Stop VDC Assistant and AppleCameraAssistant.
If you don’t have enough time and want to sort this problem fast or you need the camera right away this is the best method for you. VDCAssistant and AppleCameraAssistant are programs that are running in the background. So, if you want to terminate these two processes you will need your Terminal.
Method 2: Adjust Your Camera Settings
The Mac users probably already know that there is no camera section in System Preferences on your device. But, in the applications that are using your camera, there are camera settings that you can adjust within the application itself. With Skype and FaceTime, you can specify whether you want to use your build in camera or an external one. Make sure that you have selected the build in camera.
Method 3″ Reboot Your Mac
Another fast and effective way to fix this camera errors is to restart your Mac. But there are two things you should try when you are using this method. One of them is to restart and the other is to shut down completely. We recommend choosing the shut down because when restarting, will close your session and just for a moment will turn off your Mac but the RAM will be untouched. And when you shut down your Mac will clear everything including clear the RAM and end all processes.
Method 4: Update Your Software.
The problem with your camera may be the result of old software or may be incompatible with the applications that you are using. So, there are two solutions for this either to update your applications that are using the camera or to update your iOS on your Mac.
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