Move the bar out to about midfoot. When you get set, imagine pulling yourself underneath of the bar. This will cause your hips to go down, chest to come up, and the extra tension to be pulled from the bar. Practice just getting into this position. You’ll know you are there because you will feel a trmendous amount of tension in your hamstrings and the bar will be bent in your hands (because you will have pulled all of the slack out of the bar, which is causing your hips to shoot up in the video). Hold that postition for a split second then explode your hips forward and keep the weight centered on your heels, not the middle of your foot like you are doing in the video.
Muscles take time to develop tension. Especially in a relaxed/static overcome by dynamic exercise like the deadlift. Getting the slack out of the bar before you actually pull will have you developing the needed tension in your deadlifting muscles before you even pick the weight off the floor.
Not getting the slack out causes people to have 2 seperate pulling motions in the deadlift. The first pull involves the your bodies reaction to the slack hitting the weights. This is causing your arms to jerk and your hips shooting up first. The second pull is now a straight leg deadlift.
Also, definitely ditch the shoes for something flatter. Like chucks or cheap skateboarding shoes.