In this book I have called "Game Engine Architecture: Second Edition" by Jason Gregory (lead programmer working at Naughty Dog Inc.) the author states that 3-dimensional overlays such as a dynamic main menu in a game is often rendered using orthographic projections or via a projection via the regular perspective of a camera system, with the geometry positioned in view, which the camera follows around.
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How exactly can I do this? Does this require 3rd party software/scripting? I'm using Unreal Engine 4 and maybe it can already do this, but I dunno how. I really would like a dynamic main menu but I don't know how to implement it. Any help is welcome :)