Step 1: Get quotes from people at several of the local video shops, interview them, and look at their portfolios. Pick the one that you feel best about.
Step 2: Have them videotape your seminar and make it web-ready. Ask them to send you all raw and edited footage. You should have this in case you want to use it later.
Step 3: Have your video folks send the finished product to your web designer/developer so the video may be added to your website.
Step 4: Put the video in a secure place on your website, and ask visitors to register for the free information. Collect their e-mail addresses for future e-newsletter mailings!
Step 5: Repeat.