i am working on webapp. In this webapp i want add a seek bar, volume, current time/total time,play/pause, and a timer (time should start when the video is playing and should pause, video is paused) in this webapp i just want to calculate the total number to sec. video is played by user. thank you in advance.

Code:
<html>
<body>
   <div style="text-align:center">
      <div id="video_player_box">
...