Looking at the Google Device Access API, I don't see a command to turn a camera on or off. And I also don't see a command to turn notifications for a camera on or off. I see the camera traits here, but maybe there are commands somewhere else that apply to any type of device?
Am I missing it, or is this functionality in fact not provided?
I had hopes that I would be able to refine notifications based on smart home events, as opposed to a strict time schedule as it is now...
No, at least not at this time for Cameras.
Cameras Traits do not include connectivity - link Thermostat does list the Connectivity trait - link