Check out:
https://bitly.com/If you sign up for an account (free) you can then track the traffic of people clicking on your links.
It's important to be able to tell how much traffic you are driving. For example, if you are driving 0 people to the page, then people don't even have the opportunity to pledge. If you've driven 30,000 and no one has pledged, but 1,000 people have watched the video, this gives you feedback that people may not be interested in the product or your rewards.