Transparent background for live motion capture and performance All the questions on this subject relate to rendering, so I don't think this is a duplicate.
I'm trying to display a character for motion capture on a completely transparent background.  It is NOT for rendering purposes.  It is for LIVE motion capture and performance.
In other words, I need no plane, no world, just emptiness!
Can anyone explain how to do this?
Thanks!
The easiest method for me would be using green background in Blender and Chroma key filter in OBS Studio:


In Blender, set Display -> Render Only and tick World Background


Set World Background Color to green


Hide all UI so it looks like this, you can go fullscreen by pressing AltF11

In OBS Studio, add corresponding Display or Window to Sources list, then right click on the scene preview -> Filters -> Chroma Key, make sure the green is selected

The resulted scene you can live stream