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by semi-extrinsic 3575 days ago
IDK about current gen Apple hardware, but it was possible to do so on a 2008 MacBook, at least (academic paper and PoC app):

https://jscholarship.library.jhu.edu/bitstream/handle/1774.2...

Interestingly, on my battered, el cheapo Asus 12" netbook (2011 Intel Atom), this problem is solved very well: the on/off webcam switch physically blocks the webcam lens in the off state.