To Embed a Video From Vimeo
Use the Share button to get to the modal window that will give you the embed code:
Use +Show Options to the right of the Embed label to show all options for displaying the video. The only requirement is to make sure 'Responsive' is checked, everything else is what you think looks / works the best.
Copy the code in the "Embed" text box after all options are selected and paste it into the "Embed" dialog that appears when adding a new element in Article
Click the "Insert" button and then save the page and view it on the site to see the video.
This will ensure that there is the correct amount of space below the video.