put second camera on first person view

Hello,

I recently started to learn UE for my design project. And I need some help to build my plan.
Basically I need to put secondary camera screen on first person view. (like the video below)

what I need is just the screen in the view and other background can be empty. so I’ll start with empty space. (the shape of camera doesn’t need to be like the video)
Is there any tutorials or already existing blueprint for this?

I kinda need step by step tutorial…
please help this newby. I need a help.

Greetings,