If your account meets the requirements
detailed in the policy, you would post back here requesting an upgrade.
Note, however, that media galleries (photo/video) are limited to 1GB space, and that file storage (raw footage/audio, intermediate edits not published, etc.) is prohibited. You can't use your hosting account like Drpbox or another online storage service; files need to be for your website.
1GB is about three hours of tightly-compressed 360p video, or around an hour of 720p (again, with high compression). You'd be much better off using Vimeo, YouTube, DailyMotion or a similar video hosting service if you have a substantial amount of footage to show. You can always embed the video on a web page hosted here.