Detect if HTML5 Video element is playing [duplicate]

I've looked through a couple of questions to find out if an HTML5 element is playing, but can't find the answer. I've looked at the W3 documentation and it has an event named "playing" but I can't seem to get it to work.

This is my current code:

var stream = document.getElementsByTagName('video');

function pauseStream() {
  if (stream.playing) {
    for (var i = 0; i < stream.length; i++) {
      stream[i].pause();
      $("body > header").addClass("paused_note");
      $(".paused_note").text("Stream Paused");
      $('.paused_note').css("opacity", "1");
    }
  }
}

It seems to me like you could just check for !stream.paused.

Check my answer at How to tell if a <video> element is currently playing?:

MediaElement does not have a property that tells if it is playing or not. But you could define a custom property for it.

Object.defineProperty(HTMLMediaElement.prototype, 'playing', {
    get: function(){
        return !!(this.currentTime > 0 && !this.paused && !this.ended && this.readyState > 2);
    }
})

Now you can use it on video or audio elements like this:

if(document.querySelector('video').playing){
    // Do anything you want to
}