These UI elements are an essential part of video games, and when it comes to the design there are two main concepts that quickly transform into a much bigger scenario, these are the Narrative and the Fourth Wall. From them come four classes associated with video game UI components: Diegetic, Non-diegetic, Spatial, and Meta. All of which lead to a certain aspect of the design of video games that are worth studying and understanding. You can see the differences between them and how they work in this infographic by Toptal, featured in their Guide to Game UI by Micah Bowers.
Kevin Joyce has been working with immersive technology since 2013, establishing VRFocus.com as one of the leading AR and VR publications before joining Admix, a non-intrusive advertising platform designed specifically for immersive experiences, as Lead Evangelist.