how the embed video plays.pauses pretty much relies on its dimensions/placement of the youtube play button itself; so if it's redirecting you to YouTube, it is most likely because the iframe 'box' is too small and you are clicking the uploader's link rather than the play button

i would actually suggest increasing the height/width and then placing the iframe into another div with the overflow:hidden element and dimensions; that way, you can cut off the excess links and just keep the play button!

this is a very brief example but you can adjust anything needed!

<div style="position: absolute; left: 270px; top: 45px; height:100px; overflow:hidden">
    <iframe src="https://www.youtube.com/embed/vOXZkm9p_zY?controls=0" style="position:relative; top:-70px; height:250px; width: 200px; z-index: 5; opacity: 0.5;"></iframe>
</div>

(and also, when you are finished, set the iframe opacity to 0.0001 instead of opacity:0 as that may make the video unclickable by default)