How to create a handheld camera?

There’s surprisingly few tutorials on this, I’m wondering how I could create a handheld camera where the player has it small like a wielded item in the bottom right screen, but you can see what the camera is recording on the little screen, then when the player right clicks, the camera is brought up close to the player so that’s what they are looking through.

Hi man , here a old screenshot of how add a “camera view” to the view,
Basically , you link a camera to a render target, and the rendertarget to a widget so you can display what the camera see.

Great thank you!