Hi, @ETin2022. Situations like these are pretty hard to diagnose via email/chat. Here’s my thoughts:
Is there a new app you’re using that could have grabbed the camera? The only time I’ve seen this is then another app already has control of the camera. Most cameras have a small light that is lit when the camera is active; check to be sure yours is not lit when engaging the camera through Zoom.
Another thing is to go to the Zoom Settings -> Video tab and adjust various settings, and hopefully find something that works.
You mentioned uninstalling and reinstalling Zoom – consider uninstalling and reinstalling your camera too.
Good luck!!