Video to stretch across the entire homepage [closed]

You could add negative margins to the video element.

If inline (adjust as needed):

<video id="video_688987199_html5_api" class="vjs-tech" preload="auto" autoplay="" data-setup="{}" src="https://wordpress.stackexchange.com/wp-content/uploads/2018/04/video.mp4" poster="null" style="margin-left: -50px; margin-right: -50px;">

If in stylesheet (again… adjust as needed):

.vjs-tech {
  margin-left: -50px;
  margin-right: -50px;
}

Another option is to set the width as something greater than the parent div’s width. You would need to adjust the left margin of the element as well.

Inline (adjust as needed):

<video id="video_688987199_html5_api" class="vjs-tech" preload="auto" autoplay="" data-setup="{}" src="https://wordpress.stackexchange.com/wp-content/uploads/2018/04/video.mp4" poster="null" style="margin-left: -50px; width: 120%;">

If in stylesheet (again… adjust as needed):

.vjs-tech {
  margin-left: -50px;
  width: 120%;
}