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Upload the video to Google Drive. Open Gmail. Tap the "New"  button. Tap the paperclip icon. Select your video. Tap the "Send" arrow. Tap CONTINUE if prompted.
Depending on whether the video is on your computer or your phone/tablet, this process will vary:   Mobile - Open the Google Drive app, tap +, tap Upload, select Photos and Videos, select your video's location, tap your video, and tap UPLOAD.  Desktop - Go to https://drive.google.com/ and sign in if necessary, click NEW, click File Upload, select your video's location, click your video, and click Open. Tap the Gmail app icon, which resembles a red "M" on a white background. This will open your Gmail inbox. If you aren't already logged into Gmail, enter your email address and password before continuing. It's a red and white pencil icon in the bottom-right corner of the screen. A new email window will pop up. You'll find this in the top-right corner of the screen. Tap the Drive option (you may need to scroll down first) and tap the video. On Android, tap Insert from Drive in the drop-down menu, tap the video that you want to use, and tap SELECT. It's the paper plane-shaped icon in the top-right corner of the screen. If you've never sent this particular file to anyone, this will make sure that your recipient has permission to view the video that you send them. On Android, check the "Can view" box and then tap Send if prompted.