How can I use multiple camera and display them to one view port by one player controller?

Hello, thank you for seeing this question.

For example, you want to make a game the content of which is like this. ↓

At the upper left of the screen, pictures of monitoring cameras are displayed, and the player can controll a first person carácter using main camera. Using monitoring camera, the player has to kill enemies and defend something important.

To make a game like this, you have to use multiple cameras and display them in one screen.

How can I do this?