I completely mistook this portion of the tutorial as not pertaining to my use case because I’m not animating a mouse over interaction, but the custom bit of code Nelson suggests to force the background video into the link block worked really well. In addition to setting the HTML embed to relative, 100% height and width within the Webflow UI. Here’s the bit of code I added to the front of the embed:
style=“position:absolute; top:0; Left:0; width:100%; height:100%;”