The vast majority of surveillance cameras are sensitive to near-IR (infrared just below the visible spectrum). Your TV remote control probably uses one or two near-IR LEDs on the front.
If you have a cellphone camera or a video camera, aim your TV remote control LEDs at the camera and look at the recorded image or video. Human eyes see nothing directly, but the camera will record the near-IR light from the IR LEDs.
So to defeat cameras at close range, you need to embed dozens of high output IR LEDs into a hat (for example). The LEDs need to be cycled on and off at a frequency that will maximally confuse the camera's autoexposure circuit. This would be at approximately 2Hz (on-off-on-off, each second).
Even at close range, the humans will see nothing except a row of plastic beads embedded in your hat. But the camera clipped to his ear will record nothing except a blur of pulsating lights. It'll obviously work much better at night, but with the ultrabright LEDs available today, even daylight conditions are probably within the realm of possible.
I cannot comment on the legality of this technical response to close range suveillance cameras.