From the product website:

"Additional apps. HomeView supports compatible third-party audio and video apps from your iPhone for a familiar experience across devices."

If I had to guess this would be kind of similar to the way CarPlay supports apps, but it's admittedly possible this just means "you can use AirPlay yaaaay".

Yeah, I assume, but they haven’t shown that at all. I would be fine with a standard AirPlay video implementation.