Toofrustratedforwords Said:
"My Mac doesn't recognise my camera: My internal webcam is not recognised by my Apple Mac - it keeps asking me to install a camera. I have gone through all the recommendations from Apple, with no luck. Could this be something to do with BigSur installation? Any ideas on how I can fix this or is it a job for a technician? Thank you!"
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Troubleshooting Mac Camera::
Create New User:
For temporary use, create a new Administrator. See what happens when you log in to it. Do you still get this issue? If not, then is it a misconfiguration in the current user. If so, then you'd likely have to resinstall the macOS.
Reinstall the macOS:
Nothing would be lost. It's just that misplaced items would be placed back to where they should be and corrupt system files would be replaced by clean files. Go Here: Reinstall macOS - Apple Support. Use the third bulleted method: [command + r]. Important: Prior to installing an update or performing a reinstallation, to prevent data loss, be sure to Back up your Mac with Time Machine.