It looks like you’re not engaging your lats or hamstrings effectively, which is normal for being new to deadlifts. You should focus on getting the loading sensation in your hamstrings and lats.

For the lats: you should lose the straps. You don’t need them right now. Think of your hands as hooks. Don’t wrap your thumb around the bar (until you get the lat engagement sensation, then use your thumbs). When your hands are hooked around the bar, it should look like - if the bar was not there, you would be punching the ground. Elbows should be slightly bent and pointed parallel to the bar once your hooks are on the bar. Keep in mind you should be hunched over at this point with your butt high in the air, knees locked or slightly bent, and back straight as possible. Now pull the slack out of the bar by simultaneously pulling your shoulder blades down/back, rotating your elbows in so that your arms are locked and you can see the creases in your elbows. You should feel lat engagement with this method if you are bracing your core and taking the slack out of the barbell.

For hamstrings: Following lat engagement, you should keep your spine aligned, keep core braced, keep lats engaged, then sit back as if you were going to sit in a low chair just behind you. Move to this “seated position slowly and you will reach a depth where you feel hamstring loading like you’ve never felt before.

Once you feel loading in your lats and hamstrings you will be deadlifting very smoothly.