Re: Vive Tracker for Unreal virtual sets for video production: Do I need the HMD?
@mattpf, Take a look at this guide from Triad. On the UE4 side, their default VR Pawn autodetects the HMD and bases all of the I/O off that detection which may require customization to meet your needs.
UE4's main branch solution does compositing in-engine; we're currently beta testing a quadrant based output system for external compositing. While your experence is too early in development to be included in the beta, it's worth keeping in mind as you develop your workflow.
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