I just tried an experiment in Chrome of replace the <img> element in your slider with a YouTube embedded video, and it worked perfectly.
Here was the image code:
<img width="<font color='"#FF0000"'>406</font>" height="<font color='"#FF0000"'>226</font>" src="http://www.yourvancouvermortgagebroker.ca/wp-content/uploads/2010/12/Vancouver-Mortgage-Broker-406x226.jpg" class="thumb wp-post-image" alt="Vancouver Mortgage Broker Photos" title="Vancouver Mortgage Broker Photos">
and I just replaced it with embed code from YouTube:
<iframe width="406" height="226" src="http://www.youtube.com/embed/EbKa-Qs1dVc?rel=0" frameborder="0" allowfullscreen></iframe>
The only change I made to the code was the dimensions of the video, to match those of the image it replaced.
I'm not sure how you insert this via WP, but hopefully you can just place the embed code where you would place the image. (If it's a big problem, just get a better CMS. :rolleyes: )
You can grad the embed code for videos on YouTube by clicking the Share button under a vid and then Embed.