Gruesome video captured the aftermath of a horrific pedestrian-vehicle accident in Brooklyn. The driver of the New York City Department of Transportation truck was distraught after his vehicle decapitated an elderly pedestrian, RadarOnline.com has learned. Warning: graphic content below. The fatal accident took place around 3:30 PM on June 12 at the intersection of 92nd Street and Dahlgren Place. In shocking video footage taken at the scene, the unidentified DOT driver appeared inconsolable as he rocked back and forth looking in the direction of the pedestrian’s body, which sprawled across the…