get posts by tag to showing in a widget

You might want to go through:

https://codex.wordpress.org/Class_Reference/WP_Query#Tag_Parameters

So using tag parameter in WP_Query, you can get posts tagged to ‘video’ tag.

Use orderby and posts_per_page to get last 5 video posts.

$query = new WP_Query( array( 'tag' => 'video', 'posts_per_page' => 5 ) );
while ($wp_query->have_posts()) : $wp_query->the_post();
//your code to display posts
endwhile;

Haven’t tested the code, so watch out for typos.

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