There aren’t many things to explain, the plugin works but in my particular case the options available regarding the different video formats are not all listed.
Following the guides under https://docs.unrealengine.com/en-us/Engine/ProVideoIO would be pretty straightforward, and here in this post you could also find nice tips to find where to look if anything goes wrong.
Once comfortable with the setup, if you need to use a different video format not listed under your AJA port settings you can paste directly the “port information” and set a different resolution/framerate. For example if you want to set the video format to 1080@50i you can just copy this text:
(DeviceIndex=0,ModeName=“1080i 50.00”,FrameRate=(Numerator=25,Denominator=1),TargetSize=(X=1920,Y=1080),VideoFormatIndex=1)
And right mouse button and paste over the Port you want to set, here you have a screenshot of that paste operation
If you can be more specific maybe I can give you more detail about it. What do you want to know? dealing with the second output with that alpha key video? dealing with interlaced video?