The video below provides the full context of the frame sequence below it. The frameset includes 2:24 to 2:44 of the video.
Each frame is displayed for 1/5″. Hover over the image to pause the slide show. Within the first 50 frames, 4 smaller statured individuals follow a larger statured individual out the back entrance. The camera zooms out before any more can be seen.
The glass doors look to be standard height and are much shorter than the windows that flank on each side. Standard door height is 80″ (6’8″).
The door height is 80″. It’s height in pixels is 259 – 161 = 98 (257 was just above the floor elevation). 98px / 80″ = 1.225 px / inch. The height of the first individual is 259 – 182 = 77px, or 63″ (5’3″). The other individuals following the first individual were much shorter in stature, suggesting they may have been children.