[tom kelly]

I can not tell from your video if you are shooting with BOTH eyes open? Which eye Right or Left are you using for sight alingment & sight picture? A simple test would be to point your trigger finger of the dominant hand at the target with both eyes open; close one eye, than repeat with the other eye. The finger will stay pointed at the target for one eye, but appear to move for the non-dominant eye.
On the range, the clue that the cross dominant shooter is usually misses that impact the target a bit high, but way off to the side. For a right handed /left eyed shooter, for instance, the hits will be high and to the left. Another clue could be indicated by taking a video of the shooter and watching to see if the gun is moving slightly toward the shooter's non-dominant side or the shooter's head moving sideways as he aims. A coach or instructor can pick up these traits an adjust your sight picture into the focal plane of the left eye.
The above condition is discussed in detail in the "CONCEALED CARRY " Magazine Vol.9, issue 5 July 2012. TK