on the downwash front I'd say it's highly unlikely to be real - a Chinook leaves a visible wake on a sea's surface at anything below about 100' ASL, to give some context as to how much downwash you can expect. At the heights in that video (10-15' AGL, a standard shipping container is 8ft6) then I'd expect nothing less than chaos, destruction and mayhem immediately behind that cab. There's open container doors and fod everywhere, and nothing moves. The only thing visible under the cab is some shadow, and that could have easily been edited in.
That ‘fly past’ was flown at considerably higher speed than the slowed down video suggests. As we all know, rotor downwash
trails the aircraft. The camera movement does not allow sufficient dwell time on likely areas to determine whether any downwash was present.