I fence at a very competitive club in Quebec City (STH), amongst which are some people fencing for CISM (Which has a fencing team). Apparently the Kingston team has a good level, but it's certainly possible to join. Having talked to the Master at Arms of the Kingston club, they certainly take walk ons, after tryouts, but they also recruit athletes with prior experience. Another tidbit I've been told by my own Master at Arms is that they are looking more for the right attitude in tryouts than hard skill (Though hard skill certainly plays a role), since they will be training you and taking care of you for 3-4 years (The duration of your degree). So dedication, willingness to improve on your mistakes and general learning ability certainly do play a role.
However, not to discourage you, but I have been fencing for a year now and I am nowhere near the level of competing in official competitions. So if you want to get into fencing, expect to dedicate quite a bit of time to practice and improving your skills. A lot is also simply about moving and footwork, and it's quite different from what people imagine fencing is (From watching movies). Also do some research into the weapons of fencing, the three weapons are not similar at all. Personally, I fence Epee, and I think it's the most fun of the three, but no doubt some foil and saber fans will say the opposite.