Scale back on the complexity of the video, but still give them a high-quality product. They may be your best referral source. Keep tabs on your competition. If one starts offering a special feature, try to offer the same. Always try to think of new, creative services you can offer, so you lead the pack.
Weddings can be a lot of work.
They can also be a lot of fun. You are in the position of being able to give the couple and family a permanent record of one of the most special days of their lives.