It is a truly amazing video. None of it is actual footage, and all of it is artistic, perfect, and beautiful.
The main reason this appeals to CG artists is that it demonstrates a scene that we live in constantly, (buildings) in a way that inspires emotion and brings you in. Architectural renders are notoriously easy to make boring, but this movie is undeniably gorgeous.
Watch it all the way through. I promise it will be worth it.