I have been trying to google the answer to this for quite some time. so this is my last resort. Can I access Oculus Rift SDK Classes and functions? As far as I know the visual studio is not the compiler for the final build of the proyect so adding the library to the solusion would serve no porpouse.
This only leaves using BluePrints (of witch I have found 2 functions for Oculus Rift Compatibility) or the SDK be included with UE4.
I have found tutorials for U4 and Oculus, witch only use BluePrints. There also is the Oculus Official SDK Documentation.