Hi, I'm Bernard. I'm happy to help!
Kindly follow the steps provided by Q&A Assist. If the issue persists, check the camera settings and privacy from the Lenovo Vantage app:
Note: This is a non-Microsoft website. The page appears to be providing accurate, safe information. Watch out for ads on the site that may advertise products frequently classified as a PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the site before you decide to download and install it.
If all fails, I suggest doing a system restore, wherein it will restore the PC to the way it was working properly. To do that, kindly follow the steps below:
Press the Windows key + R, then type in:
rstrui
Then hit OK.
Follow the prompts and select the time and date when the PC is working fine.
Follow the prompts again until it restores.