You could try creating a custom module in that position. Use the No editor mode to enter some html 5 as desired. Below is an example of the video tag. You can set width to a percentage instead of a fixed width.
<video width="320" height="240" autoplay>
<source src="movie.mp4" type="video/mp4">
<source src="movie.ogg" type="video/ogg">
Your browser does not support the video tag.
</video>