I am using api and know the youtube video ID Or URL But i want the .MP4 file using id or link of video to play the video in videojs player can anyone help me and send me the source code in PHP or Javascript.
Like i have Youtube Video ID: qyObyQRsHe8
Or 
URL Link : https://www.youtube.com/watch?v=qyObyQRsHe8
who i can get .MP4 File to provide it as a src in 
<video src=".MP4 File here"></video>
I really appreciate your help. Thanks
 
    