This plugin brings Quadrant View Mixed Reality Compositing that has been supported on Unity, to Unreal Engine. Simply drop it in your project's plugin folder, enabled the plugin and wire up some blueprints. It replicates the existing Unity method for compatibility and frictionless play for those with existing MR setups that already support Unity MR.
Support for Controller/Tracker/Tracker Pro as camera.
Thanks for catching the missing externalcamera.cfg.sample file. I'll fix that in the next update. In the meantime, I would recommend using VIVR from the Steam store to generate your externalcamera.cfg file.