Blog VIdeo on Front Page

Hi, I am using visual composer. using a simple block 6 with a right widget (Default widget nothing fancy)

I would like to know if you guys can help me with something I want to do. I want to have youtube video as a thumbnail at the front page therefore on the block 6. that users can press play and see the video right away on the frontpage.

is this possible? I know with some code work it can be done. could you help me with this? check out mysite http://www.boletinextra.com

I found this plugin that will do the work ( can you instruct me where I can put the code

here is the instructions by them

Featured Video Plus: PHP-Functions

the_post_video( $size )
has_post_video( $post_id )
get_the_post_video( $post_id, $size )
get_the_post_video_url( $post_id )
get_the_post_video_image_url( $post_id )
get_the_post_video_image( $post_id )
All parameters are optional. If post_id == null the current post’s id will be used. $size is either a string $size or a 2-item array representing width and height in pixels, e.g. array(32,32).

The functions are implemented corresponding to the original Featured Image functions: They are intended to be used and to act the same way. Take a look into the WordPress Codex for further guidance:

get_the_post_thumbnail
wp_get_attachment_image