How can I build AR app in Unity using GoPro as the web camera(or IP Camera)?

I want to build AR app(Vuforia) in Unity using GoPro Hero 4 as the web camera(or IP Camera).
(I can build some AR app using vuforia if not using GoPro)

For now, I can get play the livestream GoPro Hero 4 on my Mac.(ffplay udp://:8554)
The way is here → Reddit - Dive into anything

But I don’t know play the livestream using GoPro Hero 4 in Unity and build AR app.
Is there any advice?

My goal is like this(【進撃の巨人】50m級!超大型巨人を空から撮影【ドローン&AR】 Took a Shot the Colossus Titan from "Attack on Titan" from the Sky - YouTube)

Sorry for my English.

To @CHAMPLOO

For example: