As of now, you cannot share any videos from your article box, thereafter you can share any video link easily. Whereas MindStick is still working on this and will definitely resolve it, then you can easily share videos.
To share any Video link click on the Video logo on the top Horizontal menu in the
Article writing box.
As you click a new window will appear which will let you paste video link from YouTube, Vimeo, Vine, etc.