CSS3 or jQuery - Element to move on mouse scroll using transform matirx

I found this site here:

http://theme.pixflow.net/massive-dynamic/design-studio/#team-section

And what I am trying to do is have an element move on scroll just like the images are in the site I came across.

I noticed they are using transform instead of fixed. How would I accomplish this using css and / or jquery?

from CSS3 or jQuery - Element to move on mouse scroll using transform matirx