How to Point to a specific Scene when mouse is inactive?

Hi all.

I’m working on a presentation to be presented on a Trade Show. It have an inicial movie, running in loop, but with a Menu bar, so people could stop the movie and go to a product catalogue.
I want that when people stop looking the catalogue and go away, the presentation go (after a few minutes) to the initial movie loop again.

How can I do this?

Thank’s for your attention.