HTML5 Video not playing on iPhone

Hi,
I have added an HTML5 video to my website. When I tested my page on iPhone devices, I saw the video was not playing.
How can I fix the issue?

Here is my code:

<section class="video-container">
	<video class="video" autoplay muted loop>
	  <source src="<?php echo $video; ?>" type="video/mp4" poster="<?php echo esc_url($poster_image['url']); ?>">  
	  Your browser does not support the video tag.
	</video>
</section>

• This topic was modified 3 years, 4 months ago by Jan Dembowski. Reason: Moved to Fixing WordPress, this is not an Developing with WordPress topic