Chroma Key and Filling with Level

Hello,
I will describe my idea with an example.
I have a project in which I have a stage with some characters but I have no background and I want to create it in another program.
So I want to send my current camera view to two different video outputs in my PC (1 - chroma key, 2 - filling), to omit the Unreal Editor background (clouds etc.)

Have anyone tried to create something like this? Is it possible?

Regards :slight_smile: