Script to quickly fix the errors `There is no connected camera`. Run the script as root

camera_fix_macos.sh

#!/bin/bash

# The process VDCAssistant is called whenever
# any application attempts to use the camera.
# In some cases, when the application that was
# using the camera fails to terminate properly,
# this process is still running in background
# preventing other services from access the camera.
# A fix for this is to terminate the process using 
# the activity monitor. Or just use the following script.

# NOTE: The script needs to be excecuted as root.

# This kills the process that has blocked the camers
# from being used by any application
killall VDCAssistant

# Now we also kill other process that Apple uses to manage
# camera
killall AppleCameraAssistant