Perhaps you do not want to be physically holding your camera every single time you want to shoot videos. If this is the case, you can either invest in a tripod or light stand to provide you a place to set your camera on. Now, between the two, a light stand may be better for the sole reason there is less of a chance that it will be included in your shot. With a tripod, the legs may stick out too far and appear on your video. And, while you can always edit it out afterward, it is a hassle that does not need to be there.