From my test and experience we tried :
MAGEWELL USB3 HDMI Capture - Working fine
MAGEWELL PCI Double HDMI Capture - Not working
ELGATO HD60S USB3 - Working fine
ELGATO PCI 4k60 Pro - Not working
I looks like USB capture card work easy when PCI Cards from the same manufacter shows up but doesn’t input anything into unreal.
If someone has a workaround for PCI capture cards.