setting gameview smaller resolution than window view

Hello,

Is it possible to set the game view smaller than the window resolution?

For example of having split view: I set the resolution of my window to 1920x2160, on the top part (Y: 0 to 1080) I want to display the main game view and on the bottom part (Y: 1080 to 2160) I want to show a texture grabbed from another part of the view.

Thanks