2) But if all you’re trying to do is get the video to show in your blogroll (i.e. post list), you can configure that post list to display the full content, opposed to excerpts. Then, in your post, you’d have your video and first paragraph (if you want), followed by the <!--more--> tag to lead into the full post.
3) And a third approach would be to configure your featured image to just link to a video in a lightbox popup. You do this from the “Post Options” when editing a post.