background application

The Composite Blur doesn't seem able to do what I need. What I need to do is have the active window shown clearly and all the other windows blurred. Then, when I change active windows, the newly selected window comes in focus and the others are blurred. That way, when I do a tutorial, people...

I'm trying to record Valorant game audio with the voice chat included on a separate track but the voicechat comes from RiotClientServices.exe which I can't select in the dropdown because it's a background application. I tried editing the .json file in the scenes folder but it just either...