I was able to create a component,boxplaypause to allow playback to play and pause by clicking the <a-entity> And it works, until you attach the component to two entities in the same scene. There are no errors, and the console logs show that the component runs the code, but the 'vimeo.play()' and 'vimeo.pause()' stop working. I included a version with both autoplaying, to show that both videos are able to play at the same time and that the only thing that stops working is the play pause control.... I am using the most recent version of aframe 1.0.4
This is a link to the project
https://justinwking-vimeosample.glitch.me/
This is a link to the html document with the script, you would need to use it with the server.
playback.txt