I don’t think you are following. This is possible right now on a T2 Mac with everything working properly and no hacks.
App takes still photo. Light does turn on but not for very long. How long does light stay on to take a still photo? Would you notice it?
arn
An unauthorized use of the camera is literally a hack.
If one is lazy enough to give sketchy apps unlimited access to their camera, then they need a lot more than a piece of electrical tape to protect them on the internet.