Well, look at you finding footage of easter eggs on Youtube. The Conduit Rooms are only accessible to those playing the game on Xbox 360 or Playstation 3, so that's already a tall order. Second, you need at least one save file from Dead Space: Ignition on your system. Ignition is a spinoff game set on the Sprawl of Titan Station and takes place during the initial necromorph outbreak. Once you have just one save file for the game on your system, all Conduit Doors will open to you.