Luminate does allow you to embed a video into an email, but there are virtually no email clients that will be able to play it within the email itself, unless it is opened from a web browser. A best practice tip is to create an image from the video and insert a play button to indicate it is a video. You can then link the image directly to the third party site (YourTube for instance) or embed the video on a pagebuilder page within your own site.