in-built camera is not working

Hi,

If your built-in camera isn’t working on your Mac - Apple Support

If it doesn't help, try to run Apple Diagnostics if it reports hardware related issues(NDC001, NDC003 to NDC006).

Use Apple Diagnostics to test your Mac - Apple Support

If hardware issue is reported, contact Apple or take your computer to a near you opened Apple Authorized Service or your neighborhood retail Apple Store to learn which service and support options are available.

WanphenS Said:

"in-built camera is not working: How to fix or check my in-built camera?"

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Reinstall the macOS:

You couldn't have moved system required files without having any ability to do so (which is something to stay away from). As for fixing all of this, you need to reinstall the macOS.

Reinstalling the macOS:

Reinstalling the macOS will place moved items back to where they should be, and will replace damaged system files.

1. First, Back up your Mac:

Create a Time Machine backup of your Mac, so that you can have something to restore your Mac from, should anything go wrong with the reinstall. Use an external Hard Drive of at least 1.5 times the size of your internal Hard Drive.

2. Then, Reinstall the macOS:

Nothing would be deleted. It's just that items that have become corrupted or deleted, would be replaced or reinstalled back to where they should be. Go Here: How to reinstall macOS from macOS Recovery - Apple Support