You can increase the duration and compr. quality of the video in the Capture tab of the Enscape settings.
The Duration will improve the overall experience and the compr. quality the rendering quality (bigger filesize).
If you choose to render more FPS (Frames per second) you can create some slow-motion parts as well if you edit it afterwards.
I also would recommend you to use smooth interpolation, so that the camera starts soft and slow, speeds up and slows down again coming to the stop position.
You can use depth of field in videos as well.
=>Please check out again the Video-tutorial regarding "How to create a video"