MacBook Air camera's not working

Solution 1:

A blinking webcam light means there’s a fault with your webcam. It could range from a simple hang up of the hardware or driver to an out of date firmware update or the webcam has failed altogether.

• The first thing you want to do is reboot.
• If the issue still persists, reboot in Safe Mode (hold Shift while booting). This will make it so only Apple drivers and software is loaded to remove possible conflicts
• Make sure your system is fully up to date
• Run Apple Diagnostics (hold D while booting)
• Try a USB webcam. If you get to this point and the USB webcam works, it’s a hardware failure of the webcam itself. You’ll have to decide if you want to replace the webcam which requires disassembly of the display or get use a USB webcam.