WordPress custom field or meta box to add data to footer

I have a custom theme which has a footer.php file, which contains my footer.

This footer contains two YouTube videos which I have currently hardcoded into the theme template file footer.php.

What I would like to do is control which videos are displayed in the footer from the WP Dashboard.

I am not sure what is the best way to approach this.

This is my code in footer.php

<div class="row">
  <div class="col-md-6">
    <iframe width="240" height="170" src="//www.youtube.com/embed/abcdefg" frameborder="0" allowfullscreen></iframe>
  </div><!-- /.6 -->
  <div class="col-md-6">
    <iframe width="240" height="170" src="//www.youtube.com/embed/hijklm" frameborder="0" allowfullscreen></iframe>
  </div><!-- /.6 -->
</div><!-- /.row -->

I was thinking of replacing the video URL with some variable somehow that is editable via my dashboard.

An approach I was looking at was http://mor10.com/simple-video-embedding-with-custom-fields-in-wordpress-youtube/comment-page-1/#comment-1253601

But this seems to be based around your page being a post.

Thanks