This is a request to auto-connect the camera interface for the chromium snap.
It is a pretty common use-case to do video-conferencing or other webrtc-based applications within browsers these days, and without the camera interface the chromium snap will report that no webcam can be found, which will lead users to report bugs because they want this feature to work out of the box.
Besides, chromium prompts for permission to allow camera capture on a per-domain basis, so that’s an additional level of security for actual access to the hardware.