In the beginning he is using some kind of swing-lens camera (Widelux, Noblex etc). A Widelux for instance is wound with a knob so it may look like a 120 but it is usually a 135 (they exist in both 135 and 120 but the 135 i way more common).
The camera he is using at 6:40 and onwards is most likely a Xpan with a 30mm lens. The hood and the viewfinder looks definitely the part.

I may be wrong but my money is on an X-pan with 30mm lens.