How to make a different viewing option?

In some games, there is a button and if you press it, it shows a different camera, kinda like a spectate. How would I make this. Like a gui that you press, and shows a different camera, like a still camera, that you can see yourself through.

You can modify it by getting the local player's camera (game.Workspace.CurrentCamera) and then using it's property .CameraSubject like so:

local camera = game.Workspace.CurrentCamera;
camera.CameraSubject = Other.Object.Path