Quicklinks:

- demo: http://zenpicker.s3-website-us-east-1.amazonaws.com/dropzone...

- source code: https://github.com/zencoder/filepicker-zencoder

- Full tutorial: https://gist.github.com/sh1ps/e0884be21fb3f45cbddc or http://blog.zencoder.com/2013/03/20/look-ma-no-backend-uploa...

Edited to add zencoder blog post