A gunman wearing a ski mask shot a stranger outside a Brooklyn store, in a caught-on-video incident cops said was unprovoked.

The footage shows the 24-year-old man standing outside Nostrand Mini Mart in Sheepshead Bay at around 11 p.m. Tuesday, when a masked and hooded goon walks by and pulls a handgun from his coat pocket.

The gunman fired one shot at the victim, sending the victim scrambling into the store, the footage shows.

Police said the two men did not know each other.

The victim was shot in the right elbow and was taken to Coney Island Hospital, where he was treated and released, police said.

Authorities are still looking for his attacker, who fled south on Nostrand Avenue.