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Women in Brussels 'filmed without their knowledge' by men wearing Meta smart glasses
(www.brusselstimes.com)
This is a most excellent place for technology news and articles.
I think that could fall under "Recht am eigenen Bild" (right to your own picture). It gives you the right to decide how images of you are used. If he profits off of photos/videos of her, she should have the right to sue him. It might also be illegal to publish the videos under GDPR law, especially in combination with more personal information like first name or city.
However, big festivals like the Oktoberfest often have a disclaimer that you agree to being filmed and your picture being published due to TV, press etc. being there. I don't know how that would work.
I believe (not a lawyer or expert in that field) that this does not cover covert and targeted filming.
I'd argue it's there to allow TV to make background shots and perform interviews without trouble.