problem: using the simple video card in ghost provides a very meager video player experience with no full screen capability.
problem: embedding from a 3rd party site to get a better player (ie Vimeo) gives you a more robust player, but when a post is emailed to a member, clicking on the thumbnail in the email takes the member to Vimeo, not your post.
solution: use HTML to embed a VIDEO tag in your post and include the CONTROLS option. This works in all modern browsers and allows full screen playback.
new problem: using this VIDEO tag doesn’t embed a thumbnail into your emails, they come through with text only and no evidence that there’s video in your post.