I was thinking about exploring a dual weild build as well. I just need to get my hands on a second Corrupted lightsabre first
I've been using OBS Studio to make those vids. It's free and has a lot of features. You have to record your entire desktop in order to capture D2 or at least that's the only way I was able to do it. Someone else with streaming or youtube experience might be able to give better advice. I also had to downgrade the output resolution but that was just because my computer can't quite handle recording in anything higher than 720p.
https://obsproject.com/