Asking someone in public a question isn't harassment. Doing the same with a video camera is also not harassment. If they make the polite request to stop and you don't, it would start to be harassment.
This trend isn't new. I've seen people swarmed by TikTokers on the street once or twice, then asked questions to make them look stupid and laughed at. I too was mobbed by a hardbass crowd when that was a meme on social media about ten years ago. I was on a second or third date with someone at a restaurant, and it wholly ruined the mood when my date and I were made fools on some video that luckily never went viral.
It's not strictly dangerous or harmful, but it's definitely not a social interaction most people want. When you are the subject, it feels like you've been taken advantage of against your will, and publicly humiliated. And if the video goes viral, that's exactly what you will be.
And you're making this claims about all videos in this format or what? The "Man on the street" format isn't anything new. I don't think you have any evidence to state this as an absolute.
I'm sorry you had a bad experience with a video camera in public but you can be publicly humiliated and harassed without a camera too.
My disagreement is that there is no law requiring consent to film in public and there shouldn't be. We should clearly define what kind of behavior is considered harassment and create more avenues to reduce it but that is irrespective of recording. Something that was harassment without recording is still harassment with recording and vice-versa.
You're the one who makes the claim.
Is it "harassment"? I don't know, I'd say probably not quite. It's certainly is rude and annoying beyond what I would consider reasonable.