Seriousguy98 Task Manager says that my GPU is going up onto 90% for 3D rendering when playing a video.
If this is still the case, it's not using your graphics card for hardware decoding. Task manager should show 'video decode' activity on the GPU section when playing VR videos, not 3D rendering activity (or not much, definitely not 90%). The RTX 2070 shouldn't have any issues with these videos if it's using the hardware video decoding. LAV filters and using DirectPlay in DeoVR/SLRapp should work, but if task manager still shows 3D rendering instead of video decode something is configured wrong and it's probably still not using hardware decoding.
(also there's little difference if it's playing from local files or streaming, both are video that need to be decoded.)