Question: Was the ice-cream man in 'Mr. Nice Guy' the same ice-cream man who is seen briefly in the park in 'Rumble in the Bronx'?
Question: Why do the bad guys want the video tape that they are after?
Answer: The cocaine deal, that had gone bad, between the mob and gang. They were afraid it would be turned into the police.
How did the video get recorded in the first place?
The two reporters, Diana and Richard, were hiding above and filming it. After the shootout there's a explosion which exposes them. The mob boss sees them and tells his men to go after them.
Answer: TV Reporter Diane, played by Gabrielle Fitzpatrick, and her crew film the drug deal between the mob boss and the street gang.
Answer: Yes. His name is Emil Chau. http://www.imdb.com/name/nm0154235/. Such questions can usually be answered using The Internet Movie Database http://www.imdb.com.