NEW YORK — A 61-year-old man who died after he was shoved to the ground outside his Brooklyn home was sucker-punched by two men who then robbed him as he lay dying, video released by police Thursday shows. Victor Vega was found unconscious suffering from a massive head injury in front of his Bedford-Stuyvesant home on Lexington Ave. near Nostrand Avenue about 8:25 p.m. May 25, police said. He died at Kings County Hospital Monday. Surveillance video released by the New York Police Department shows he fell backward after a man he was walking down the sidewalk with punched him without warning in …