How to setup Motion Video Slideshow Backgrounds for OBS Facebook Live with Chroma key

How do you add video or slideshow backgrounds on your facebook lives, zoom meetings and vlogs?

I use the 1080p Logitech c920 Webcam

Pop up 5×7 green screen

Green Chromakey Paint:

Selfie Ring Light

A great microphone and boom stand setup

Super Quiet Reliable Apple USB Keyboard:

When you are working from a laptop and you need a 2nd monitor´╗┐