Disclosed herein are apparatuses, systems, methods, and machine readable media for activating a portable camera in response to the activity of a firearm. A communications channel may be established between a firearm telematics sensor and a video camera, sometimes by means of intermediary devices. When the telematics sensor detects that its associated firearm is removed from its holster, or in motion, or being discharged, it may signals the camera to initiate recording.