Video has shown the chaotic scenes that unfolded when two gangs opened fire on each other in a shootout, during which an aide to Andrew Cuomo was killed by a stray bullet.
The trial of four men accused of killing Carey Gabay during the Caribbean J'Ouvert Festival in Brooklyn, was shown the footage by NYPD detective Raymond Wayne, the New York Post reported.
The footage, taken from a camera in doorway, shows large number of panic stricken revelers fleeing down the street as the shots rang out, with some trying to get through the door to safety.
Gabay was a Harvard-educated lawyer who was raised in public housing in the Bronx by Jamaican immigrant parents.
The 43-year-old was named first deputy counsel for New York's economic development agency in January 2015, prior to which held the position of assistant counsel and worked for the governor since 2011.
Last year, Brooklyn District Attorney Ken Thompson indicted Tyshawn Crawford, Keith Luncheon, Micah Alleyne,