https://bf4db.com/player/1028973279
This is a longer version of the video. At 0.46min the player kneel behind the box, at 1.00min kill through the box, at 1.54min he gets up.
There is no glitch, he kneel behind the box and can not look or shot over the box. I tried it out.
https://bf4db.com/player/ban/1028973279#reply-116884