How to answer to this polite, but strange request?
I agree with both previous commenters: publish your algorithm first and then point them to the YouTube video. If you cannot or don't want to go the traditional journal publishing route, at least, consider self-publishing a paper, describing your algorithm, at a preprint or e-print server, such as arXiv. At the same time, I don't see a problem with this request, IF it involves sharing only data, but not the algorithm itself.

If you see the value of and are serious about commercialization of your algorithm, consider filing a provisional patent application with USPTO and/or Swiss patent agency. I'm not sure about possibility and details of applying for provisional patent in Switzerland, therefore, I refer you to this page, which seems to be relevant. It might be easier to skip filing provisional patent application with USPTO and file a standard one in Europe to establish the priority right (for example, see this page). Should you be thinking about going the patent route, I would definitely recommend you to consult a legal professional, specializing in intellectual property (IP) domain.

Disclaimer: I'm not a lawyer and this answer does not represent legal advice.