If you've been running the Oculus DK1 in the Vizard 5 Beta it was not required to install the Oculus Runtime. Now in Vizard 5, you'll need to install the Oculus runtime and follow the instructions in the
Oculus documentation.
If you're using the DK2, you'll find some additional information in the
Oculus DK2 and Vizard article on the WorldViz knowledge base.