Check out example codes for "html video autoplay IPHONE". It will help you in understanding the concepts better.

Code Example 1

<!-- On IOS devices safari block the autoplay by default. 
Playsinline allows to force autoplay and avoid this restriction --> 

<video autoplay loop muted playsinline class="video-background">
  <source src="videos/intro-video3.mp4" type="video/mp4">

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