Depth Of Field test

Using After Effects and two photographs, I put together a test piece.

I masked out a photograph of a skateboarder, then placed it onto a Background of a road.
Enabling a 3D layer, I moved the background back on the Z-axis, then scaled up to fill the frame.
Adding a camera with DOF enabled, I changed the focus to keep the skater crisp, blurring the background. I then keyframed a dolly, making the skater appear to move faster than the background itself.
This was just a piece I put together as proof of concept. It's an effect I plan to use on the final piece as a break away section, transitioning from scene to scene. In my mind, it would be done when introducing a character being interviewed; "Hi, I'm Chris" *Transition showing Chris on the hoverboard*

This effect is used in both film and game,
Film example, The Walking Dead Intro (AMC);
http://www.youtube.com/watch?annotation_id=annotation_651539&feature=iv&src_vid=O8W9qr7DB-o&v=yYveggi9zxI
Centipede running across shells and Prison pan at the end are good examples of this.

Game example, Infamous (PS3, Sucker Punch)
http://www.youtube.com/watch?v=MV45E6D47Hw
The Cutscenes in InFamous (And Infamous2) are done in a comic style, subtle animation for the character animation, backgrounds holding the more "In Your Face" animation. Using the different Planes, it adds great effect, adding depth to the 2D art.