There is no way to embed video in email. Generally, what is done to simulate a video in email is to host the email on a website and put a image in the email that looks like an embedded video, with start button and all, but when you click on it you are taken to a website that actually hosts the video. This involves a number of steps, from producing the video, creating the simulated image, and hosting the video. You can do this all on your own or hire a company to do any parts of it. I presume you are a reseller for a company that offers these services.