Camera showing grey/black screen

Regardless of the app I am using the built-in PC Camera for, the problem is the same. A grey screen. Some apps show that the camera is already being used by another app. This happens even if I have camera access given to just one app.

I have tried all the fixes recommended for similar issues so far. This includes restarting, all the checking updates and uninstalling and reinstalling drivers and all of that. I have also tried uninstalling and reinstalling the default Windows Camera app. Still nothing has changed.

Curiously, this problem arises out of nowhere. On some odd occasion, with no adjustments whatsoever, the camera starts working perfectly. And then, all of a sudden, it goes back to grey. Websites like Google Meet show that the camera failed. Curiously, this does happen only when an internet-based app or website tries to access the camera, and that too, only after some 30 seconds or so. The camera light remains on even after closing everything. It goes away only when I go to Device Manager and click on "Scan for Hardware Changes" or make any other changes there.

Maybe another noteworthy point is that before the camera fails completely, the image it shows real-time gets a sudden green tint.

I need a fix for this, asap. There are several important things I need the camera for.

Thank you.

P.S. I tried to add a screenshot but the file is failing to be uploaded. In Windows Camera, it just shows black, in the camera preview in Settings, it's a light grey, in the Whatsapp app again, it's a light grey but it shows the text that the camera is being used by another app. The camera light remains on even after disabling camera access.