Regarding the 3gp video and other specifics you mentioned, I couldn't find any information that would allow me to provide details on that. If you could provide more context, I'll do my best to help.
This Tamil film starring Kamal Haasan features a poignant search for a lost daughter within the brothels of Sonagachi.
Furthermore, the 2015 thriller Kolkata (released as Calcutta in some markets) and various Bengali art-house films have utilized the atmospheric intensity of North Kolkata’s lanes to depict mystery and crime. In these narratives, Sonagachi is often framed as a zone of danger or moral ambiguity—a trope that is both a staple of entertainment content and a point of contention for critics who argue it sensationalizes the lives of the workers there.