I've been in the same position, waiting patiently while mentally cursing people to "get out of the way"!! Last week I spent nearly an hour waiting unsuccessfully for an architecutural scene to be clear of people (too open a view to ask them individually)!
Originally Posted by munz6869
If it were really necessary (and practical), I would chat to someone pleasantly, explain what I was trying to do, and ask politely if they could just spare a moment and move for me. I've never had any trouble, and often the person has shown interest in what I was doing, and even apologised for not realising! BUT, if I were a professional photographer or film-maker, I would consider it appropriate to get any permits or authorities necessary in a public place, and, even then, use common sense and decency rather than being heavy-handed.
Or just choose a time and day when the place was quiet.