<div id="videoHolder"></div>

  $(function(){

    $(window).scroll(function(e) {

        var scrollAmount = $('body').scrollTop();   
        console.log(scrollAmount);


    if(scrollAmount >="theamountyouwant" && scrollAmount <= "theotheramountyouwant") {


        $("#videoHolder").html(
            '<video width="1200" height="700" autoplay>' +

         '<source src="https://vimeo.com/232114395" type="video/webm"></source>'

         '</video>');