I don't have any experience uploading videos to aws with S3 bucket.
I don't have any plans to work on themes for powerstore. Powerstore is designed to let users design and create their own themes. I'm really not that much of a designer or graphics creator. If I did create more themes then you probably wouldn't like them.
I can help you implement your own theme into powerstore. If you design a page layout then I can show you how to add it as a theme and use it in powerstore. It doesn't take long to do.