Ask HN: Easiest way to turn Raspberry Pi into fool-proof video chat machine?

I'd like to send my folks a Raspberry Pi with a camera, preloaded with some sort of video conferencing software so they just start the thing up and press "Call" and it calls me in video chat. The only thing they should have to configure is their wireless info. This seems to be outside the realm of things people have built disk images for, and would likely have to be built from a buncha packages and scripts, right? Seems like a very useful thing to have right now.