Is there an extension that allows people to upload their videos to my site?

Hi all, I'm trying to build a video hosting site with similar features to youtube (ie; allowing them to upload video from their local drives) and which also allows users to ad content by recording a live stream via their webcam. Does anyone know of any dreamweaver extensions that would enable me to build a site that functions in this way, or can anyone reccomend an alternative method? Many thanks and all the best.. Dan