Minimal data to run the demo

Hello! Thanks to your excellent video visualizer. I am interested in using it to visual video prediction. However, I found that to run the demo, I need the data in a specific format (the video files, json and h5 files in video_visualizer.cfg). Could you provide me the minimal data to run the demo？

Review video_visualizer.cfg to identify the required video, JSON, and H5 inputs for the demo. Confirm the expected format and assemble or document a minimal dataset that lets a new user run the demo successfully; done means the demo works with only that provided data.

Written by the indexing model from the issue text.