1. If you piece the code snippets together in the post, it'll work. Nevertheless, I'll be posting a downloadable source file soon.

2. Our cloud.files module does have a 5GB file size limit. However, you are free to store your data elsewhere (probably on EC2 for fast and free data transfer), and access it using PiCloud. For example, you could store the video files on your own CouchDB server running on EC2, and simply query the server in your code (using the python-couchdb module) for the video.