Photo booth app showing there is no camera connected.
Camera is not working at all for any app photo booth as well as Facetime.
MacBook Pro 15″, macOS 10.15
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OK. This. might be a hardware fault :-'(
However, try this: Reboot holding down Command-Alt-p-r. All being well, the Mac will keep rebooting every 15 seconds or so. After at least four reboots, let go of the keys.
Then try again.
If that doesn't help, you may need a hardware repair.