Examples of transmit power controls are described herein. In some examples, an electronic device includes an imaging capturing device to capture a video stream. In some examples, the electronic device includes video processing circuitry. In some examples, the video processing circuitry may measure background motion in the video stream. In some examples, the video processing circuitry may detect human proximity based on the measured background motion. In some examples, the video processing circuitry may control transmit power in response to the human proximity detection.