Unreal has finally released 4.20 and a link to how to use their Mixed Reality Framework as well as downloading a executable for calibration is listed below. If you don’t need to calibrate your controllers, you can skip that and go right to adjusting for your camera. The sad thing, is the only thing I was able to get to work with it was Logitech C920. If you have a Magewell USB3 V2 they claim it works as well and then you can hook up any HDMI camera to it. Sadly my Magewell USB3 V1 does not work and the Magewell USB-3 V2 is $299 on Amazon and for now I have been using the C920 with okay results. Sadly the C920 is 4:2:0 MP4, so the chrominance component has only 1/2 the resolution of the luminance which means key edge is pretty ragged. I am testing this when it comes in Friday (https://www.amazon.com/gp/product/B07DLB33NG/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1) I will reply back if it works. (Sadly the same results as the Magewell USB-3 V1)
Here is link to Unreal’s Mixed Reality Tutorials - https://docs.unrealengine.com/en-us/Platforms/MR