Unable to access Webcam on MacBook after updating to macOS Catilina

i had no problems with any previous operatingn systems...till i upgraded to catilina

i tried the sudo killall stuff..nada

tried my time machine back up...when thru the steps of erasing mac and reinstaling fro time machine..but still no webcam...

i dont know what to do now...i love my mac...but if i buy another one i wont be updating just because i get a update msg...what a pain and no one seems to know how to fix it

[Re-Titled By Moderator]