Seems to work. No error code 43 in device manager of guest OS.
I followed the instructions from 2nd video, but i didn't tried with a monitor connected, just with a VNC remote connection.
I tried before to pass through the GPU with another Linux based distribution, but in that case didn't worked or i didn't succeed.
Host:
OS: unRAID version: 6.3.5
System: Dell Power Edge T20, CPU: Xeon 1225 v3 (with integrated GPU)
Guest:
OS: Win 8.1 Pro x64
GPU: GTX 1050 Ti (4 GB), NVIDIA driver: 376.09