Your ISP will limit the size of messages.
It'll typically be somewhere between 5 and 100 MB.
Note that I'm not talking mailbox storage, rather message size limit.
Even if your ISP had a big enough limit, they wouldn't be able to deliver it to the recipient's server, because that server would also have a limit.
So email is not suitable way to send a file of this size.
If you simply want to share the video upload it to youtube, you can leave it set private so it's not public.
Or if you want to share the file then upload it to a file sharing site such as dropbox or similar.
Andy
PS) I run a few mail servers, and I think the largest message I've seen a customer upload so far was just over 6GB. Yikes nice try :p