I don't think that makes sense though considering the other pic his arms are forward.
I think that considering the angle of the camera, the laptop is on the floor, or something very low to the ground , which means he was kneeling forward typing or making adjustments to the camera in the pic of him "at" the laptop (facing forward) and in the other pic (facing sideways) he has leaned back on his heels and his arms are hanging back a bit. Maybe even stretching. But I don't think handcuffs.
Just from these two pics it appears as though he is actually the individual in the room who is setting up and/or adjusting the computer/camera.
I think people are reading a lot into just a couple of stills, and their minds are going to very dark places but there are a few factors that make me think that (in this particular video at least,) the child we see isn't the one being victimized.