If you select the video file, then choose the send icon, choose Mail, the enter your own address. Assuming the video file is too large to email (most are), iOS will ask you if you want to send using Mail Drop... The dialogue asking this question shows the file size.
If you select the video file, then choose the send icon, choose Mail, the enter your own address. Assuming the video file is too large to email (most are), iOS will ask you if you want to send using Mail Drop... The dialogue asking this question shows the file size.