See the tutorial http://omnomrobot.com/tutorials/sourcetutorials/mfmailcompose/
In this tutorial, replace lines 28 and 30 with
NSData *imageData = [NSData datawithContentsOfFile:[[NSBundle MainBundle]pathForResource:@"video" ofType:@"mp4"]]; [mailer addAttachmentData:imageData mimeType:@"video/mp4" fileName:@"video.mp4"];
Change the video format to the appropriate format.
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