Can Oculus Rift be used with Slicer ?
Some preliminary integration work has been done. See http://slicer-devel.65872.n3.nabble.com/Oculus-Rift-td4032779.html
Can Oculus Rift be connected with Slicer through OpenIGTLink ?
Oculus requires very tight integration with the rendering pipeline, so probably the current approach of using a C++ loadable module that directly communicates with the Oculus SDK to get pose and send images is better than going through OpenIGTLink.