How to get some information from the_content [closed]

You could initialize the video shortcode – with the function do_shortcode. Exemplary usage would be like this:

echo do_shortcode( '' );

Extra information:
I have given an extensive answer to a similar question a couple of weeks ago. You should take a look I’m certain it will help you out. Especially if you still need to grab the source from the content. Additionally it offers another possibility to display the video.