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I am a solicitor.
Yes, you are free to do what you propose to do, please see this advice from the Met Police: https://www.met.police.uk/advice/advice-and-information/ph/photography-advice/
You would own copyright in your videos.
May I help further?
As you are the "creator" of the video, you own copyright in it and can licence people to use it for a royalty or fee, if you wish to.
In a public place, you are free to photograph anyone or film them, there is no right to privacy in a public place. If you take their photo whilst they are in their garden, that is a different matter.
No breach of GPDR in a public place.
All the best
You are welcome.