IANAL and it depends on the jurisdiction. The following is what happens for Canadian shows:
For a creative type show, generally they ask permission to film you or they they set up cameras that records quite a lot but then they request permission to have you appear in the show, if they find your participation interesting. Much more is usually filmed than is shown for nearly all such shows.
However, there is freedom of press in many countries and if they were to have obtained permission to recording the immigration area (for a purpose such as a documentary on immigration handling) than your permission is not needed to be included as part of the footage. If they are speaking directly to you than would have the choice of denying the interview. It seems like the Canadian one was marketed as a documentary, in which case the rules are more in favor of the press. With such major production, it is often possible to ask for anonymity. They can either blur your face and distort your voice or have a reporter recount the story withholding your name.
Credit:stackoverflow.com‘
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