Voice overs are a very specialized field. Not everyone can do it right off the bat, but everyone can learn how to do it. The more exposure you get to it, the better you get. Trust me. There are not too many voice over classess in in Vancouver, mostly weekend workshops.
These classes are not voice over classes per se, but they help performers develope their voice potential.
Voice over work is essentially acting in front of a microphone, therefore it is important for the actors to hone their craft. Here are two places that I feel will give you the best training you can get for film and tv acting. I recommend that you audit these people courses, and as many others as you like, to find if they work for you.