I used to think that if a weight didn't go up in a few seconds that I had to abort to save my back.
Traditional Conventional Deadlift
With a Traditional Conventional Deadlift, the bar usually comes off the floor well with the sticking point being in the knee area.
Some individual, like Anna demonstrated in the video that she posted a while back, grind it off the floor and have a strong top end pull.
Have the intent to accelerate the bar as it comes off the floor
Compensatory Acceleration, CAT
Dr Fred Hatfield
This means, no matter how heavy the load is, "The Intent"/effort exerted needs to be on pushing/pulling a heavy weight, as hard and fast as you can. Doing so innervates the Fast Twitch Muscle Fiber.
Hatfield devise this method back in the 1980's. Hatfield demonstrated this during a competition...
Dr. Fred Hatfield (Dr. Squat) 1008lb / 457.2kg squat
Hatfield was the lightest lifter, at one time, to Squat over 1,000 lbs.
Generating Momentum
To reiterate, most Traditional Deadlifts have good power/speed coming off the floor. Lifters who can generate power/speed off the floor should do so.
Speed is metaphorically the grease that enables you to slip through your sticking point and maintain enough momentum to finish the lift.
Deadlifter's who are somewhat slow off the floor should strive to accelerate the weight off the floor.
The majority of Traditional Conventional Deadlifters who grids getting the weight off the floor, don't make it past the knees.
Traditional Conventional Deadlifter with this issue need to focus their training on breaking the weight off the floor with Haulting Deadlifts, Stiff Leg (slight break in the knees) Deadlifts, Deficit Deadlifts, Isometric or Functional Isometric Deadlifts off the floor or a little off the floor, etc.
Sumo Deadlifters usually struggle to get break the weight off the floor. Once they break the weight off the floor, many can complete the lift.
Your Deadlift looks good.
Kenny Croxdale