Yes you can embed a video in your listing. Simply paste the embed code into the description box and then save the changes. It is important to note that the characters in the embed code will be counted. So keep that in mind as there is a 1000 character max.
The embed code will look something like this:
<iframe src="https://player.vimeo.com/video/1234567890" width="640" height="360" frameborder="0" webkitallowfullscreen mozallowfullscreen allowfullscreen></iframe>