"Different" Parallax Scrolling effect

Question

I'm working in my new portfolio, and I want to do a effect like this, in the site:

http://nizoapp.com/

The effect of the iPhone and parts appearing from the sides when we scroll. It's a kind of parallax scrolling.

I tried to search how to do but I can't find. So I "stole" the code saving the page and adapting the code but seems to have many unnecessary things.

Someone know how can I do this?

Answer 1

Parallax: the apparent displacement of an observed object due to a change in the position of the observer.

Parallax is one particular scroll effect, simulating depth with relative scrolling, for example.

If you're interested in scroll effects more generally, then a simple search yields many plugins and round-ups.