If you are technically savvy enough and comfortable with HTML, you can look into embedding your video to your message using HTML5.
Just like with adding an image, your video needs to be “sourced” on any platform that hosts videos and allows them to be embedded in emails.
It is important to note though that playback will still depend on whether the email client/service provider of the recipient supports it.
The best alternative, and our recommendation, is to use image hyperlinks rather than embedding the videos. An image hyperlink is an image/picture that links to the video when clicked by the reader. The image, in this case, would normally be expected to look like it was the thumbnail for the video.
Helpful resources: