Frame the video to include from below your feet to above the highest point that your racket reaches. The higher the camera the better with along the line of the ball's trajectory often catching very informative shots, such as your arm-racket angle at impact. However, 30 fps won't catch near impact very often.
Shoot in bright sunlight so that the camera's automatic exposure control might pick a very fast shutter speed and the video will have small motion blur. (The motion blur in your video was small.)