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I want to completely disable full screen functionality.
I removed fullscreen button like this.

videojs('videoPlayer', 
 controlBar: 
 fullscreenToggle: false
 
 );

But on double click it still goes to full screen.
How to disable double click?

Darius Oleskevicius helped me with the answer on videojs github page: https://github.com/videojs/video.js/issues/5604

The current dblclick handler doesn't take into consideration whether fullscreen toggle is disabled. It is on by default and there is currently no settable option to disable it. As of now, you could try and cancel out dblclick listener on tech (see below).

player.ready(function() 
 player.tech_.off('dblclick');
);

Also if you use reset function, you have to again remove dblclick event listener.

You can use CSS to initialize the various control-bar objects
to exist or not.

See, for example: https://github.com/videojs/video.js/issues/2507

So, for your case, just use:

<style>
 		.video-js .vjs-fullscreen-control display: none; 
</style>

EDIT:

Ok, I figured out what's up with the "double-click" !

I still run all my video pages, using version 5 of videojs.

Version 5.11.9, to be exact.

And, it turns out that double-clicking on a video back then, did NOTHING.

So, bottom line, if you truly 'want to disable 'double-click-to-fullscreen',
it can be done. Just use 5.x, rather than 6.x or 7.x

Having said all that, I now have to consider this a bug in 7.x (and 6.x).

The code inside videojs SHOULD be testing whether the fullscreen-control
exists or not, and if not, the double-click should NOT be going to fullscreen.

The list of versions is here: https://github.com/videojs/video.js/releases