This is an interesting point. I understand that taking the video of ford (even without his consent) is probably not "illegal" (meaning there is no law against it).
However, what happens if you try to sell the video? So for example, if you try to sell a sex video of rob ford, is there a law against that? What about the selling of
the video of ford ranting and raving? Do you not need fords permission or is that covered under "news" because he is a public figure?
What happens if it is just you or me?
First, a sex video is different than a crack video. Sexual acts are understood to be of a private nature, while committing a drug crime is not.
Second, public figures have less privacy rights than you or me. By entering politics, Ford expects the media and public to take an interest in his character. It is important that society know what sort of person we have elected.
That said, selling the video is not illegal. However, threatening to make the video public unless payment is made would be extortion. It seems likely to me that the video sellers may have offered it to Ford under terms that could be considered extortion. We would need Ford to testify about that, and so far he is refusing to cooperate with the justice system.