Many countries now have popular reality shows which are filmed at immigration control (e.g. Australia, Canada, and the UK). These programs film both ordinary and scandalous events, and there is at least anecdotal evidence of both border officers and producers pressuring travelers to participate in one of these shows.
If I am at an immigration checkpoint and observe filming is going on, how can I avoid being shown in these programs (even in the background), without aggravating immigration officers who might want people to participate in these shows?