play pause html5 video javascript

From what I see, video is not a function, so why do you have parentheses? That's your error.

So instead of video() just use video

$('#play-pause-button').click(function () {
   var mediaVideo = $("#media-video").get(0);
   if (mediaVideo.paused) {
       mediaVideo.play();
   } else {
       mediaVideo.pause();
  }
});

I have done this in jQuery, which is simple and fast. To try it, you just need to use the ID of the video tag and your play/pause button.

EDIT: In vanilla JavaScript: a video is not a function, but part of DOM hence use

 video.play(); 

Instead of

video().play() **wrong**