It might be helpful to separate the code that creates the parallax effect from the angular app that displays the website & examples. This is a really cool trick and it would be nice to be able to easily reuse it. For those looking, it seems like the "magic" happens in a couple of spots (I think):
https://github.com/panrafal/depthy/blob/master/app/scripts/p...
and in
https://github.com/panrafal/depthy/blob/master/app/scripts/c...