Bioshock Assets HELP

HELP ME! I want to put in some Bioshock assets in UDK, and try them out in my Game! How do I do that? Please explain. EXAMPLE: Here is a video of a YouTuber with the assets:
Bioshock On Unreal Engine 4 - YouTube

Please Help!
Thanks!

He probably didnt use assets from Bioshock, he most likely created them himself.