Where do I start – software driver for hdmi port

Hi, I’m working on making a product and for this product I need to interface with the computer through an hdmi port but I don’t want to display the desktop, I want it to have a custom interface, kind of like how the oculus rift interfaces through an hdmi port but doesn’t display the desk top, I know I’ll need to make a custom driver for it but I can’t find any only resources to learn what I need to know