Its possible. Gmail has a 7.5gb storage limit. I have no idea what the upload speed would be, but I suspect it would be dismal.
Its also possible to get a free storage account online and upload a dvd to it. A basic level membership at Adrive.com is free and allows 50gb of storage.
Edit: By the way, this discussion is about distribution of a dvd-video. As such, you should hold full rights of ownership/copyright of the movie in question if you wish to get advice in these forums. A home made dvd, for example, is well within the boundaries of discussion here.