It is hard to see the acceleration well from that angle. It would be better to get a side view during acceleration as well as a closer front and back view.
Some of the problems that I see during the latter part of your run is that your heel strikes the ground well in front of your COG; i.e. low hips. To begin to correct this, I would continue to get stronger with weights, continue sprinting and work on some plyos. As you continue to get stronger and better at absorbing and producing force, your initial strike should move closer to your COG.