Custom "demo" / screensaver mode on iPad Pro

Hi!

I am using an iPad Pro in my store to help people with their purchases. I would like to have some sort of a demo mode, or a screensaver really, that activates after some period of inactivity. It would be a montage of the press we have gotten, so would need to be a completely custom thing (which could be even a video that plays after, say, 5 minutes of activity).

Does anyone know of 1) a demo mode, that can perhaps link to a webpage or something like that, that can be activated or 2) an app that would allow me to do this?

I've searched several times, maybe just not using the right search terms, but I cannot find anything like this.

Thanks!