Sometimes respected members of a research community may say something interesting and pertinent in a talk, but the nugget of insight might never make it into a peer-reviewed publication. Nevertheless if someone "important" said it, say someone with seminal contributions in the field, then their spoken insight might still be useful to consider and comment on in a thesis.
Is this accepted practice, especially in the field of computer science? During the Covid pandemic many interesting talks, masterclasses, seminars, workshops etc were given and are recorded on youtube. So is it ok to reference these? What form of referencing would be most appropriate? I'm thinking it can be thought of as just a web page, but would you want to give the date and venue more formally, or just leave that to the main text of the thesis?