The Key Content and Places tile would allow you to insert the video URL for the desired video. Unfortunately there is not a way to feature the video unless it is in your group.
If this is something a you would like to see in a future release of Jive, you are welcome to create an idea for the feature here Ideas for Jive, this would allow others to vote up the idea and help it gain visibility with our products team. This Blog has more details surrounding the new Idea process Welcome to the New Ideas for Jive
Hope this helps.