Perspective Shift Images (someone else do this for me)

I feel like some IndieHacker has done something where you can upload a regular screenshot and get something like this:

http://media.steampowered.com/apps/dota2/images/international2013/watch_replays.jpg

If you don't have an idea, here's an idea. Ad-supported, or monetized by creating watermarked image that can be removed with $$$. I don't even know how to do this without running Photoshop and following some tutorials.