This is brilliant, and brings to mind Marco Arment's excellent Bugshot[1] for iOS. Of course, this won't work for more complex interaction bugs, but perhaps support for animated GIFs could be added?

Edit: just seen the pricing, $19/mo seems a bit steep, and there's no free tier, just a trial. Shame. They're positioning it as an integrated bug reporting solution, but I think it would get more adoption as an atomic tool with more approachable pricing.

[1]: https://itunes.apple.com/gb/app/bugshot/id669858907?mt=8