Fascinating video. Is Calcutta the Indian city of choice for gritty street life? Or could he have been in any Indian city? (I've never visited, but would like to.)
In my time, Calcutta had the reputation for the most crowded and possibly the most poor. It attracted religious social workers like knives to a magnet.
Bombay had the rep for business and street whores - well, little cabin whores, shall we say? It was also the entertainment capital which I think it has made even more its own in the past fifty or sixty years. They do wonderful photographic work:
https://www.farrokhchothia.com/ It's always been a grave error to underestimate India.
Not a place I want to return to see anymore, but for many years I did. I feel too worn to take health risks now.
Rob