Video player UI in Javascript/JQuery
This script mixes jQuery DOM lookups (e.g. $(".respond")) with native DOM lookups (e.g. document.getElementById('videoElement')). It is best to use only one style to avoid confusion (e.g. for anyone reading your code, including your future self). If you are going to load jQuery on the page then you might as well use it. Otherwise if you don't need it then it could reduce the page load time slightly if it is removed. You might find this article interesting. 

Indentation is inconsistent, though maybe that was a mistake during insertion of the code into your post.

The first line in playVid() references videoElement which looks up the element by id attribute implicitly. 


function playVid() { 
    videoElement.play();



This can also confuse readers of your code. Because myVid points to that same element, that variable could be used instead.

function playVid() { 
    myVid.play();