I did this accidentally once too! The video was too big to email to anyone. I could not find a way to convert or cut the video on my phone. I ended up uploading it to youtube as private, and emailing the link.
Another option is to upload the video to dropbox, in a shared folder, and select who you want to share with. This Is what my iphone friends do, since I can't view iphone vdeos on my Android.