You can try the following steps to resolve the issue if you are running Mac OS 10.7 and your camera is not working.
Instructions for camera/video unavailable on Mac OS 10.7
- Go to the Finder’s Go menu.
- Choose Go to Folder…
- Type /Library/QuickTime in the window that appears
- And click Go.
- Remove the following files:
- Sonix SN9C201 WebCam.component
- Sonix SN9C102p WebCam.component