Your wedding day is the most important day of your life. So it needs to be captured in a video to preserve it for life. When you become old, you can sit with your grandchildren and enjoy an evening seeing the video and remembering the good times. You will need to hire someone professional to capture all those precious moments. If he is a professional, then you will not need to mention the intricate details he needs to capture. He will already know what to do. A pro would know all the tricks of the trade that is required to make the video look sleek and attractive. He will know how to make it look elegant and creative.
You can also ask one of your relatives to shoot a video for you but then you cannot expect it to be as good as the professional version. So it is suggested that you spend some money on someone professional rather than have it done by an amateur. After all, it is to be cherished for life.