The ten minute video complete with dual subtitles is a rambling speech by scarf-covered-face-AK-carrying-man in front of a couple of Toyota trucks in the classic Boko Haram production.
During the dialogue identification papers are shown from the attack on a small compound and a vehicle convoy which is shown in the second half of the video.
Injured people are shot dead and one man is beheaded in the tray truck. The video concludes with a revisiting of the October 2014 Nigerian jet wreckage which was in reality the result of the Nigerian Pilots bravery. (here)