the_permalink() and the_post_thumbnail() echo their output. Use the "get_* version of those functions, get_the_permalink() and get_the_post_thumbnail() when concatenating a string to be output.
Both the_post_thumbnail() and get_the_post_thumbnail() will echo/return <img> tags so don’t wrap their output in an <img> tag because it’s already taken care of by those functions.
The original HTML posted is missing quotes and I’m not sure why you have the <head>, <style>, and <body> tags in there; those tags are not necessary.
This code will output a linked image:
<?php
echo '<a href="' . get_the_permalink() . '" target="_blank">' .
get_the_post_thumbnail( get_the_ID(), 'video' ) . '</a>';
?>
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