i paused the video at the top of your backswing and your left arm isn't straight....while this isn't essential to be a good golfer, it certainly helps you be consistent...i suggest shortening your backswing until you can straighten your left arm better.
also your takeaway isn't very good.
at this point, your club should be parallel like so:
to fully analyze your swing, you should also video your swing from behind so we can see your swing plane, for i would say 90% of swing faults are due to swing plane.