Remote help on non-desktop devices

I was helping my mum turn her iPad wi-fi on and off. Since remote controlling her iPad is not an option, I was dreaming of an app like this. It could probably work for repairing bikes and choosing the right meat at the supermarket, too.

It works like this: The person who needs help opens an app and connects to the helper person. Once connected, the app turns into a camera preview and streams the video to a client on a desktop, tablet or even a phone at the helper side.

The helper can then speak and point out subjects in the view. In this case, the wifi on/off switch on his mum’s iPad. To make sure the dot doesn’t float around, the app could use simple video processing (like contrast matching) to make it stay in place.