>>2827622It's not tricky at all. I took this photo last Saturday without even knowing this was a thing.
You don't just walk up to a stranger and say "Can I take your photo for a *mumble mumble*" while looking at the floor, you in stead take an interest in another human being. You talk to someone while they're working, and have a human interaction, taking an interest in their lives, and listening like someone who doesn't have a mental disorder. You then mention that you'd like to take a photo of them, after talking to them for a while (during with your photographic interests have come up)