Full screen camera URL?

I’m running “fully kiosk browser” on a tablet, from which I’d like to display a camera feed full screen when motion is detected. However, I’m struggling to find a way to find a URL within HA that shows a camera feed. Is there a way I can make a camera picture card full screen? I see occasional mentions of accessing /api/camera_proxy/camera.name, but I can’t get that working (I get a 403: Forbidden error).

Any tips?

The simplest thing would be to use kiosk mode custom integration to hide the sidebar and title bar. Then create a panel card page and show the entity as a picture entity card.

Thanks, I’ll give this a go!