Creative Walk On Screen:
Why I like it is because the camera is unobtrusive, its not highly edited it, or stylized, its two guys walking and we observe it. They capture our attention and we remain transfixed, our lives on hold, as they pass by engrossed in their own conversation and oblivious to us and our desire to be a part of their conversation.
two different ways to capture the audio, the easiest would be wireless radio mics, however you could also adr this scene. The camera remains steady till it follows along with them briefly at the end.