Customize a codeigniter Script

Hi, I am looking for a coder who can help me customizing a codeigniter script. The script is basically made for uploading videos with controller video. But i want to make the script for uploading documents. So you may need to customize the following : 1. Database fields 2. Post Submitter in front end to support files 3. Customize routes 4. Create thumbnail images of documents. Let me know , if you can do it.