How to send a video in an email:
1 - Load the video to a video hosting platform. ie: youtube, Vimeo, etc.
2- Take a screenshot of the video to create an image.
3 - Navigate to your Calendar tab.
4 - +Add New > Email
5 - Compose the email
6 - Add the screenshot image to the email.
7 - Double Click on the image
8 - Add the link to the video in the URL area