One word of warning though....it can look closer than it really was if they pull in sharpish after you. This is because of the camera's reduced field of view, i.e. it sees ahead of you and not besides you. In this clip he does look like he is pulling in quickly, thus giving the impression of being closer.
However, despite that, it still looks like he was well within 3 feet when next to you.
It's difficult to really appreciate how close it is without feeling the wind. But if I imagine my elbow another foot or so to the right, that was close Pulling across you so soon after the overtake is really bad too - it looks like the same old problem of assuming a bike is a stationary object that can be ignored once the front wheel has cleared.
It begs the question again though: Is it really worth the aggravation of confronting them after this - I'd say with video like that, just send copies to the police and the bus company and let them have the aggravation.