Usually, the camera simply has no IR filter so it picks up IR all the time. You ...

Aeronwen on Feb 12, 2021 | parent | context | favorite | on: Making glasses that hide your face from cameras

Usually, the camera simply has no IR filter so it picks up IR all the time. You can test your own cameras out by pointing a TV remote at them and pressing a button. The blinking should show up in the video.