Back button without navbar

Hi there,
I am using a view as a fullscreen image viewer. To have a nice fullscreen experience, i dont want to have a navbar.
But i still want to have a back button in the top left corner.
Is there some way to achive this out of the box? Or do i have to do it manually? And how can i do that? I want this button to be positioned, look, feel and behave like the standard backbutton that comes whit the navbar.
Any help is highly appreciated.

Best regards