You can obscure your face from many cameras with bright IR leds, but then you become "that one guy who's face shows up on camera as a bright washed out blur."

You can obscure your face from many cameras with bright IR leds, but then you become "that one guy who's face shows up on camera as a bright washed out blur." It's like trying to hide an airplane from radars by broadcasting megawatts of broadband noise; possible but not particularly useful.