To insert a video in a banner, you can use HTML5 video tag with autoplay attribute. Here's an example code for that in HTML:

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<div class="banner">
  <video src="path/to/video.mp4" autoplay muted loop></video>
  <h1>Banner text</h1>
</div>

In this code, we create a div element with a class of "banner". Inside this div, we add a video element with a src attribute set to the video file path, and autoplay, muted, and loop attributes set to automatically play the video in a loop without sound. Finally, we add any text or elements we want to display on top of the video, in this example a h1 element.

You can adjust the video file path and attributes to your needs. Keep in mind that not all browsers support the autoplay and muted attributes, so it's a good practice to provide a fallback image if the video can't be played.

To add a video as the background of a webpage, you can use HTML and CSS.

Firstly, you need to add the video to your HTML code. You can do this using the <video> tag. Here's an example code:

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<video autoplay muted loop>
  <source src="your-video.mp4" type="video/mp4">
</video>

The autoplay attribute will automatically start the video when the page loads. The muted attribute ensures that the video will play without sound, as most browsers do not allow automatic playback of videos with sound. The loop attribute will make the video play continuously.

Replace your-video.mp4 with your video's filename and location.

Next, you will need to use CSS to style the <video> tag to display as the background. Here is an example CSS code to achieve this effect:

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video {
  position: absolute;
  top: 0;
  left: 0;
  min-width: 100%;
  min-height: 100%;
  z-index:-100;
}

This code positions the video behind all other content (z-index: -100;) and makes it cover the entire viewport (min-width and min-height set to 100%). Adjust the values to fit your specific use case.

Here is a link to an example of how to add a video background to a website: https://www.w3schools.com/howto/howto_css_video_background.asp

To make a background video with CSS, you will need to include both the video source file as well as an additional video poster file. Here is an example of the HTML and CSS code you would need to use to create a background video:

HTML

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<div class="video-background">
  <video id="backgroundvideo" playsinline autoplay muted loop>
    <source src="BackgroundVid.mp4" type="video/mp4">
  </video>
</div>

CSS

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#backgroundvideo {
position: fixed; 
right: 0; 
bottom: 0;
min-width: 100%; 
min-height: 100%;
width: auto; 
height: auto; 
z-index: -100;
background-size: cover; 
overflow: hidden;
}

You can find more detailed instructions, including CSS for mobile devices and additional attributes, at this link.

You can autoplay and loop a video using HTML and the <video> tag. Add the controls attribute set to false and the autoplay and loop attributes set to true, like this:

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<video autoplay loop controls="false">
 <source src="example.mp4" type="video/mp4">
</video>

For more information check out this tutorial.