Video production is a service which many companies offer to businesses and homes. Video production companies discuss the project with the client, and based on their request put together a crew and film the event. An example of this is a business commercial or promotional video, or a wedding. After the project has been filmed, the video production company will then edit the rough film, and add music and effects to the make the video a professional product.
Video production isn't cheap. sport ter known companies can often charge a lot more than a individual contractor or small company. Your best sport is to phone around and get quotes. An important thing to remember is always check out a companies portfolio before hand to get an idea of how professional they are. Many video product companies are relatively mediocre, meaning they don't do a great job.