Was browing some wordpress themes and stumbled upon this one.
http://www.pixarwpthemes.com/wordpress/reborn/
It seems the mainslider images are fixed and the background moves over them but I can't seem to find exactly how it's done in the code. Can anybody help me out with this?
This site uses supersized.js jquery plugin for horizontal sliding images at the background.A plugin that is very easy to implement, check out the documentation and demo files.
And uses stellar.js for the vertical movement.