Well, not sure what your budget is... but assuming you may be like most people wanting to not spend a grew amount. Good 'ol Fiverr has people on there ready to make all kind of videos for your website. There are also people here on DP and over at the WF listed in the services area that will be more than happy to help you create a video promo for your site. Good Luck
You should learn to make videos yourself. It is not as difficult as you might think. You can reach a point where making videos is as easy as posting on this forum.
Got to agree with both posts here. Fiverr is really good for this type of micro-job. Quick, easy and cheap. But make sure you check out the providers approvals and comments. Making videos is not that hard. If you want to get screen shots you could use: (Not affiliate links!) http://www.bbsoftware.co.uk/BBFlashBack_FreePlayer.aspx or: www.screenjelly.com or www.screenr.com Sweet as.
Video promotion is among the most popular current trends. Video promotion is a highly web promotion technique and is already a proven method. Video promotion lets you easily broadcast news or information related to your business to online world. Online video or internet video promotion is a great way to visually showcase your products and services in an effective and interactive manner. Video promotion can be easy to do. There are many ways to use video promotion. Now, by using the video promotion, people cannot only see what the business looks like but also have a face to identify with.
I think for video promotion you should make video manually and promote it on youtube, dailymotion and vimeo.
manually doing would be good. but if you want, you can hire someone at high traffic marketing sites like fiverr.