Vimeo has the code here: https://vimeo.zendesk.com/hc/en-us/articles/115004485728-Autoplaying-and-looping-embedded-videos
Here's the code they provide:
<iframe src="https://player.vimeo.com/video/76979871?autoplay=1&loop=1&autopause=0" width="640" height="360" frameborder="0" allow="autoplay; fullscreen" allowfullscreen></iframe>
I used a video block and opened up the brackets. Then dropped the code in and changed the video player link to my video (the numbers before the "?".
