In whatever content has your static block has whether it is video, image, text, html, contact form, etc
You can call it in your theme or template (.phtml) by inserting this code
This code will be printed in your template, just ensure that you inserted in a correct html elements
<?php echo $this->getLayout()->createBlock('cms/block')->setBlockId('custom_static_block')->toHtml() ?>
But first you need to create static block, to do this from your Dashboard go to
CMS > Static Blocks
custom_static_block must be found in the Identifier* field. See the image below
Do a HTML and CSS adjustment after inserting it..