Parabolic would only work if the camera is in the focal point, so you’d need a different part of the parabola or a different parabola depending on where you are standing relative to the camera. This is in addition to the aiming mechanism.

And even then, I’m not convinced it will damage all camera techs instead of just overexposing the image or frame for some. If they just clamp the affected pixels instead of trying to maintain the relative brightness, they might be able to still see your face clearly.