I have an idea, make the menu with all image file type (like .jpg, .jpeg, ...). Any URL with that file type will be auto embed, with more complex URL, you can let the admin set it in Option like Video embed.
I think the video embed is a basic thing too. But with user today, they are too familiar with auto embed of video or image on Facebook. If we only make automatically on video, I think they will ask from day to day "Why you don't auto embed imagefor us?"