Just throwing in my 2 cents, even though it's impossible to determine what is going on with this video alone.
It looks like you are actually side-bending to the right, causing the left half of your thorax and rib cage to be elevated relative to the right. The scapular movement itself looks fine to me, but if half of your rib cage is sitting higher than the other other half, then the scap on that side is going to be elevated as well.
For a quick test and work-around, try engaging your left ab wall and oblique to "pull down" your left rib cage. If this fixes how the movement feels, theres a good chance that the problem is related to thorax position and not the scap itself. That said, it's entirely possible that issues with your scapular mechanics still exist -- possibly as a compensation for what is happening at the rib cage. A GOOD physical therapist should be able to see what is going on and get you on a treatment course to work it out.
To Jordz: I point this out not to be a know-it-all or a jerk, but because you work with clients and the information may be useful: tightness and impingement are too very different things, and the subscap and mid traps are too very different muscles that don't occupy much of the same area. I see nothing in the OP's post that would lead me to think he has an impingement issue going on or a problem with his subscap.