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Since I can't see the approach in this video, I can't tell what your approach was like.... But by the time you got to this jump, your horse's canter was looking pretty weak and underpowered.
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It looks like your canter may have been a bit weak coming to your first fence, as your horse jumped it a bit high and weak. But your second and third fences were quite nice! On the turn to fence 4, it looks like your horse may have gotten a little heavy on his right shoulder.
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You look to be a very solid rider, with a strong seat and leg. At times you look to be quite tense in your shoulders. Which is likely caused by the fact that your head and neck tends to jut forward, well ahead of your spine. Look at this drawing:
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