Use post video & post thumbnail inside the Theme

I try to use set the post thumbnail and the video at the same time inside my theme. The problem is the video doesn′t show, how should I do it?

firt show the post thumbnail:

<?php the_post_thumbnail('single', array('itemprop' => 'image')); ?>

then I use this code for the video but don′t work:
<?php the_post_video($post->ID,'single'); ?>

How can I do it if I want to use the post thumbnail apart of the video?

https://www.ads-software.com/plugins/featured-video-plus/