Chilling video shows the moment a crazed neighbor executed a father and his stepson in cold blood in a Brooklyn apartment hallway during an argument over noise Sunday night. The distressing footage obtained by The Post opens with a man dressed in all black pacing angrily outside his upstairs neighbors’ apartment on the fourth floor of 1418 Brooklyn Ave. in a well-known East Flatbush housing complex where stars Barbra Streisand and Michael K. Williams grew up. A woman emerges from the apartment and exchanges words with the neighbor, who was identified by cops Tuesday as Jason Pass, 47. A short...