I've gone through this entire video taking screen shots and lightening it up, frame by frame from the moment they cross the street. A few of things struck me.
First, he looks light skinned. I know LE said he's a black man but he doesn't look like it from the lightened up video, unless he's a very light skinned black man (which is entirely possible).
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Second, whatever it is she's holding in her hand here in this screen shot, it looks like she's trying to keep it away from him? If you watch this section at 2:01 to 2:04 in the video
https://www.youtube.com/watch?v=SsuY6zze1Zs you'll notice she holds it out and away from her (and him, I'll assume) several times. It could also be just something she was holding and the way her arms would have been flailing.
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Third, he does hit her before he puts her in the car

At 2:13 while they're struggling at the back of the car you can see him raise his arm over his head and bring it down real fast. It looks blurry here (and it doesn't look much better in the video but you can see it if you go frame by frame) He quickly gets her in the car and they move out of view of the camera immediately after that.
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I tried hard to get shots of the front of the car but the street light reflection on the car made it nearly impossible. Best I could do:
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Nothing really new here: front plate, windshield sticker & shape of the front headlights. I tried running a few different filters on it but this is as good as it gets with my limited skills.