How can add loading animationin image in video.js

Here is my ……

<video id="example_video_1" class="video-js vjs-16-9 vjs-default-skin vjs-big-play-centered"
controls preload="auto" width="640" height="380"
poster="thumb url"
data-setup='{"example_option":true}'>
<source src="video url" type="video/mp4" />
<p class="vjs-no-js">To […]

See original post by invalid@example.com (Tuhin1234)