Our version of Catalina hasn't got AppleCameraAssistant, but it has got VDCAssistant.
Launch Apps/Utilities/Activity Monitor > Memory and search for VDC. Select it, and hit the "X" in the top left corner to quit or, as necessary, force quit it. No need to get involved with Terminal.
Can't hurt...I guess...
I also guess that it would pay to restart afterwards.
The new Great Equalizer is the SEND button.
In Memory of Harv: Those who can make you believe absurdities can make you commit atrocities. ~Voltaire
