There is (in general) no expectation of privacy in public in Europe. How you can use the material though, is a different matter ...
Besides that there is the issue of publishing said footage, as others point out.
Does it really count as "actively doing it" when the glasses are constantly filming while you do other stuff. With a phone/camera people can see you are filming or taking pictures. In many countries the shutter needs to make a sound when taking pictures. For video surveilance cameras a noticeable sign or sticker is needed.
So if you take a video of specific people looking at flowers at the Keukenhof you would have to ask them for permission if you are recording them primarily and publish it but recording for yourself is fine as it is a clearly public space. If you take a picture of all the flower and catch some people in it in the background you are fine. If you do it in a place where people do not expect it they can ask you to remove the video and they have to (e.g. in a restaurant when you are eating as it is not expected to be recorded there).
There are some exceptions for journalism, law enforcement and public good. I doubt strongly any Meta (AI) post would classify for that.
There is also the small caveat that if you can avoid recording innocent bystanders you must. E.g. putting up a doorbell camera and pointing it to the street instead of your door is bad as it's easily avoidable by putting it top down.
Wouldn't that make "photo cloud backups" without consent illegal as well?
People do that all the time, sending private photos to Google, Apple etc.
If it transpired Google or Apple had staff looking through people's cloud photo backups, yes this would be considered a violation because "cloud backup" is framed as a personal solution and not a hosting or processing solution.
It's not the same as doing this systematically (like Meta here), but these are shades of gray. A serious privacy law would prohibit both.
Sadly that means it is not enforced well since it is too broad to be enforced in a meaningful way. And therefore it is violated A LOT, both by companies or people since no one can be bothered!
AVG (GDPR) includes the following things as personal data: name, address, phone number, passport photo, information about someone's behavior on websites, allergies, customer or staff numbers, recognizable recordings and more.
Rule of thumb, any information that can be used to relate a specific person.
https://patch.com/illinois/lakezurich/il-student-punches-pro...
Different laws in different countries.
> before filming random people in the street?
That would make taking pictures impossible, so no, such a requirement cannot be reasonably() codified into law.
() By reasonably I mean in a way to be actually followed. Of course there are lots of impossible laws created by politicians to cater to their fan base.
I sometime ask this person to hide the camera and they generally understand my feeling.
If you could not take photos of people in public places it would imply banning a lot of things that have been acceptable for a long time.
However, audio recording of conversations is prohibited.
Filming is legal. In public spaces (streets, parks), there is no "reasonable expectation of privacy." You do not need permission to point a camera. The exceptions are usually for offensive or harassing type of filming.
Publishing is regulated. In EU, once you share the footage , you are "processing personal data" under GDPR. There are also exceptions where publishing without permission is legal. Legitimate Interest (security footage or incidental background), Public Interest/Journalism, and Artistic Expression.
Generally you must ask permission to publish, not to film. Although asking permission to film is good ethical principle too.
Even having a fake camera pointing at a public space can be forbidden as it creates surveilance pressure on people using the space.
I mean, otherwise countries couldn’t use security cameras
If you needed consent to film people in the street, security cameras (in public places) couldn't be used. They _are_ used. So it must not be the case that you need consent to film people in the street. Assuming there is not just widespread lawbreaking, I suppose.