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Saris | on: Webcam head tracking, webcam to control in‑game FOV
Tons of people use head tracking like this via TrackIR and similar setups, it's quite common for space or air sim games.
PetitPrince | parent
And even with milsim FPS, as those blog posts from more than 10 years ago shows: https://dslyecxi.com/category/trackir/