Great product idea. Cameras already have panorama & HDR modes, it's not super far-fetched to imagine selecting an object present on different frames and having the camera compose it, or even having the camera choose the relevant object automatically.

The problem would be to put this in a camera for kids. If I judge by my own, kids are expert at breaking things. So the camera would have to be super strong, and super cheap, so that replacing it when it inevitably breaks isn't too painful.

Interesting constraints...