Where footage does get used is narrow: confirming who was in the home if something goes missing or gets damaged during a showing, or as evidence if a dispute over condition arises later. That is a defensive use, not an offensive one against a specific buyer's negotiating position.
Buyers understandably worry a seller is reading their reactions on camera to price the counter-offer, but a licensee acting on that would be operating outside the disclosed reason for the recording and outside Saskatchewan Real Estate Commission conduct rules.
If you are uncomfortable being recorded, say so to your agent before the showing rather than after, particularly on a home priced near or above the Saskatoon benchmark of $444,700 where negotiations tend to be closest. Get your hand-reviewed valuation from Joel Dyck.