I developed a website for a company and it requested a video just below the menu, and that this video was automatically reproduced, until then nothing else I used the following code:
<video preload="auto" autoplay="true" loop style="height: 700px;" >
<!--<source src="assets/video/entrada.mp4" type="video/mp4">-->
<source src="assets/video/enter.mp4" type="video/mp4">
Seu navegador não suporta HTML5.
</video>
Just one thing in this code in browsers Firefox, Edge, and Opera worked well for automatic playback, however in google Chrome, which is the most used, no! So my help plea as I do to reproduce this came automatically in Chrome already tried also via iframe as in the code below:
<iframe width="1520" height="700" src="video.html" frameborder="0" allowfullscreen ></iframe>