You may want to ask what level of effects if any are included in the package. Keep in mind that these effects and or animations are editing intensive and most studios will either limit the amount or charge an additional fee. Normally this is not a problem in fact its a growing trend. I know of no video photographer who will dare interfere with the still photographer or get in his or her way. Normally they are far better skilled at posing and capturing the moment, offering an excellent opportunity to furnish your video with a collage of shots on the bridal party and family.
Video format lacks the resolution of still cameras and therefor makes poor prints.
You can however get a nice looking slide show for viewing on a personal computer. Some studios are now offering a CD version of your wedding that consist of various snap shots captured from the video and put onto a slide show presentation. Not all video photographers will offer this service, but I personally find it to be a nice addition. You can certainly help by teaming your photographer up with an eager assistant who is relatively familiar with the guests and doesn't mind prompting for on the spot interviews. A good time for this type of activity is either before or after the formal dances, when people are more relaxed and responsive toward being video taped.