The video for tennis strokes should be high speed video with small motion blur. When you video a tennis stroke make certain the racket is always within the frame. For your serve the racket leaves the frame and impact is not visible.
In the serve, you appear to be doing a Waiter's Tray serve based on the racket face orientation facing the sky just before it leaves the frame. If WT, this video hides how the high level serve works. Roughly 60% of active tennis players use a WT technique.