Welcome to the forum. Yes, just include it like any other attachment. (In BT Mail click on "Attach file" above the text box in Compose; email clients have something similar.) You might run into difficulties if the file is too large.
Thanks for the reply. My clip is only 17 seconds but it says file is to large I thought that would be okay. Nevermind.
You could try sending it as a ZIP file. A ZIP file size could be a lot smaller in size. In Windows, a right click on the videofile, select 'send to' -> 'compressed (zipped) folder'. May be worth a try.