Not so. Ontario is a "one party consent" jurisdiction. So long as one of the people in a conversation is aware that it is being recorded, the recording is legal. What is not allowed is third party recording - you can't spy on other people with video equipment. But you can record yourself, even if you are interacting with someone else. For example, when I sell a gun online, and the buyer picks up from my home, I do record the whole interaction, just in case. In Ontario that's legal. In some US states, I would have to have told the buyer they were being recorded.
Things get murkier when it comes to a sexual relationship. I think most people would want/assume that recording someone having sex is illegal, even if you are also in the frame. I am not sure what the law is in that case -- it may be illegal, it may be legal, it may be that the courts have never really had to deal with it. You can bet that a judge would take a very dim view and look for ways to crack down on the person making the surreptitious recording -- but whether there's an actual law? I don't know.
But in the normal case you can record yourself interacting with other people without having to inform them. You just can't record third parties without telling them about it. (So you can't record your guest in the bathroom, because you're not there and they didn't consent, etc.)
