I am not an expert, but it looks like you are straigtening your knees/using the hip hinge too early. I think your knees should still be slightly bent until the bar is raised above them. Doing this should help put more emphasis on your glutes/hamstrings and less on your lower back since you can keep the bar closer to your body.
Your form on the way down is great. See how your knees bend as the bar passes them? Try to mimic that same motion, just in reverse of course, on the way up.
I recently read these articles from Eric Cressey:
3 Coaching Cues for Strength and Conditioning Programs - Deadlift Technique Edition | Eric Cressey | High Performance Training, Personal Training
Deadlift Dynamite: What a 1,000-Pound Pull Can Teach You | Eric Cressey | High Performance Training, Personal Training
My personal favorite cue that I found on a website a few years ago is to "push your knees out" when you are at the bottom about to start the lift. This fires your hip flexors and hamstrings so that they take the brunt of the weight at the bottom instead of your lower back.
Keep up the good work!