We have a Video widget planned for a future release but right now it is not yet part of Cayenne, so you won’t be able to see your video camera feedback in a Cayenne widget just yet.
You can probably activate one with Cayenne though! – if you have a camera like this one which can operate via the Linux command line, then you could use our MQTT API to fire Python scripts which can run these commands via your dashboard. See this article that I made earlier this week on how to run Python scripts from Cayenne dashboard buttons.