What's on that link describes a very different situation from "should you be allowed to film and post online (for profit no less) private citizens who have explicitly withdrawn their consent, just because you happen to be filming them in a public place?"
The police are public officials. The law in question says it is not illegal for citizens to record public officials, including police officers. I would imagine this is partly to help citizens keep their police force accountable. So this person was well within their rights to 'not have a private conversation' with the police officer.
But it's a very different situation from, say, filming someone who does not wish to be filmed, or harassing someone in public by filming them and then posting online publicly, and pretending it's fine just because you were in a 'public place'.
The technical legality of the situation aside, given that these individuals politely (initially) requested their faces be not shown on public youtube videos (for profit no less), and this person made no effort to even blur at the very least, then I have a hard time finding right with him.
We're not even talking about whether a private individual should have the right to film such that this might be presented as evidence in a court of law if required. So this is not a free speech issue. This person is simply putting it on youtube for money. Without reasonable consent. Yes not everyone in the video needs to give consent, as this can be implied if they walked through a scene and the recording was 'non-hidden'. But these people explicitly denied consent. There must be some sort of GDPR thing at play here at the very least.