My philosophy is whatever works, so I'll just tell you two things that you do that I don't do, and if you like doing it that way, whatever.
1 - I hold the elbow right beside my body, not out in front. I hold it with the elbow bent 90* and with the ball's weight entirely in the non-throwing hand. I think this keeps my balance better. Fans of the hinge would also say to hold the ball closer, I believe. The good new is taht you appear to hold the ball in the swing path (No video from behind so I can't say for sure).
2 - My first 2 steps are shorter than my last 3 steps. I don't know why that would be important. the reason I do it (probably not the reason a coach would give) is that it gives my swing more power on the forward going side - the downswing? foreswing?. In other words it goes up in the backswing slower than it falls forward in the forward swing, without my having to do anything with my arm muscles.
Can't tell much about your release or follow-through due to blurring.
One more thing:
3 - In my stance, the two feet are closer together. The slide foot is closer to the foul lines, as is yours, but only a little bit, not a foot and a half closer. For "power" strokes, my right foot's arch is at my slide foot's heel and slightly angled towards the right, just because it seems to get me where I'm going better. Come to think of it, I do that for all my strokes. It started on power strokes, though, and seems to have migrated to all my releases. Hmmm. Is that a bad habit?
(my usual disclaimer...)
"If it ain't workin', you're either throwing the ball wrong or throwing the wrong ball."
"Follow the oil!"
"Dry lanes ain't worth a shot!"
"I love the smell of lane conditioner in the morning!"
current avatar is Gabby Hayes. Looks a lot like me!