How can you create a website to allow other people to upload videos?

First of all, you'll want to use a web framework. Ruby on Rails and Python+Django are two of the easier language/framework combinations if you're not an experienced programmer. You'll need to look a lot into web security if you want to handle transactions. File uploading is pretty easy with the frameworks. More importantly, you're going to need a lot of storage space and a high bandwidth cap on the server. An hour long video can take up quite a bit of space.