Go to [Skynet Database], and select any of the following entries:

Human Central Archive:
John Connor, Kate Brewster, or General Robert Brewster

Artificial Intelligence Interface:
Series 850- Model 101: Infiltration Unit, T-S "Terminator," T-1 areal and Ground Assault Vehicles, or Hunter-Killer Units.

When the standard feature on that character starts, press [Right] once, then press [Up]. You will see the video in the top right corner highlighted in a red border. Press [Enter] to access bonus behind-the-scenes footage.