rffe

var videoLink = document.querySelector(".vjs-tech").getAttribute('src');


var oReq = new XMLHttpRequest();

oReq.onload = function (oEvent) {
  var blob = oReq.response;

    var url = window.URL.createObjectURL(blob);

    var a = document.createElement('a');
    a.style = "display: none";
    a.href = url;
    a.download = getCourseName()+'.mp4';
    document.body.appendChild(a);
    a.click();
    document.body.removeChild(a);
    window.URL.revokeObjectURL(url);

};

oReq.open("GET",videoLink,true );
oReq.responseType = "blob";
oReq.send();

function getCourseName()    {
    var listTagNames = document.getElementsByTagName("LI")
  for(var i = 0; i < listTagNames.length; i++) {
    var obj = listTagNames[i].getAttribute("aria-current");
    if (obj == "true") {

    var content = listTagNames[i];
    var courseName = content.getElementsByTagName("div")[0].getAttribute("aria-label");

   return courseName;
    }
  }
}