Of course, take advantage of all of your social channels (Facebook, LinkedIn, Twitter, Google+, blog) to get the word out.
Facebook
If your startup or company has a Facebook Fan page, you'll want to post your video there to get feedback and expose your following to it.
You can also use paid tools like the Promoted Post feature to make sure more of your
network sees your video.
If it makes sense to you to run ads against your video or crowdfunding campaign, you can get pretty targeted with Facebook.
LinkedIn is a more mature and professional social network than Facebook - and can, depending on your product or service, offer you a market with more disposable income. Don't ignore your contacts here especially if you're looking to make a major increase in campaign funding.
Personal InMail is a great way to get noticed.
If you've begun to build a loyal following - either personally or for your company - tweeting a link to your video or crowdfunding campaign where your followers (and strangers through RTs and hashtags) can follow the link back and participate is huge.
Vine is Twitter's 6 sec video player, it might also be a great opportunity for teaser clips!
Google+
Google+ is another social network that is gaining a large user base and following. It's relationship with YouTube makes it really easy to share your video and message publicly and to specific communities if they exist.
Blog
You should always blog for yourself and your community. But with a crowdfunding campaign, it's especially important to have a distinct area where you can provide more information to anyone who's curious or really excited about your product.
Developing a active and successful blog can also facilitate the next step which is getting guest features, coverage on other blogs and press coverage.