A tripod for a video camera must be stable so it can record stable images. The tripod head also has to move smoothly and without jerking. That's why fluid video heads are often used for filming. If you're going to capture moving subjects, you can use a rig that follows the subject in one smooth line. With a stabilizer, you can also move yourself, without your image looking jerky. There's a different video tripod for every subject that you want to record.