I think you'll be more likely to get assistance with this on a Sharepoint-oriented forum since this really isn't an iPad issue, per se. Sharepoint, though, does not provide true streaming features; it will only host a video file for downloading. You can probably set up "fast start" so that the video will start playing before it's completely downloaded, but I don't know for certain that Sharepoint supports that part of HTML standards. Someone on a Sharepoint forum would probably know. For basics on the coding, do a web search for something like "html video fast start".