setting video to parallax

[andrit]

I have a site that im looking to add an event to my bg video that pauses the video and then makes it parallax.
I dont want to show the poster, I want to pause the video where its at and conditionally make it parallax, and then switch back on a separate (click) event
I have tried passing in a class to the video wrapper and the video element which sets background-attachment:fixed, but its not making the change.