Would you like a specific fix for the error or app you’re using with /dev/video0 ?

# Find camera VID:PID lsusb # Then create /etc/udev/rules.d/99-camera.rules: SUBSYSTEM=="video4linux", ATTRSidVendor=="xxxx", ATTRSidProduct=="yyyy", SYMLINK+="video0" Don’t rely on /dev/video0 being the same camera after reboot or plugging in another webcam. Use V4L2 device names or udev symlinks for stable access.

guvcview -d /dev/video0 List supported formats:

sudo usermod -aG video $USER # then log out and back in Or test temporarily with sudo before fixing permissions. Use ffplay (from ffmpeg):