Camera on Macbook Pro 2014 flickering
When I turn on the camera (either Facetime or Photo Booth), it starts flickering. Same for the green light.
MacBook Pro 13", macOS 10.14
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I would first try doing an SMC reset to see if that helps:
How to reset the System Management Controller (SMC) on your Mac - Apple Support
If the issue is the same that makes me concerned it's a hardware issue. However for good measure you can set up a new test user account to see if the problem happens there as well:
How to test an issue in another user account on your Mac - Apple Support
In addition, you can try Safe Boot Mode to see whether or not it does it in there:
Use safe mode to isolate issues with your Mac - Apple Support
If it does, then that likely confirms it is a hardware issue. You can try running a diagnostic to see if that picks up a problem, if it doesn't I would try running it several times if it doesn't pick up a problem the first time. If it's a loose connection, it may not be detected:
How to use Apple Diagnostics on your Mac - Apple Support
But regardless (whether it does or not) you'll likely want to seek service if you want to get the built-in FaceTime camera repaired.
The camera light is basically a physical feature (not software controlled like it was many years ago) so the fact that both it and the output is flickering does lend itself to being a hardware problem (i.e. loose or faulty connector making only intermittent electrical contact).