Its a bit tricky to use with the Rift since it uses the old GUI system, you probably have to modify it to use the new UI system and then put it in world space. Should not be to hard since mostly its just modifies some alpha values over time.
I did it the dirty way. Generated a plane in 3D space with the image of the splash and made the code load the scene.
Even if I used the LoadLevelAsync
to load in background, when loading the scene the motion tracking did freeze, so ended up loading the level directly without splash as it is just a showcase demo.