Yes, you can. Kindly view this store finder fullscreen demo

You can download the store locator fullscreen source code here

To exit full screen, you can use below function

document.webkitCancelFullScreen();

Using your own embed code steps as below:

1. Download the source code
2. Go to line 30 and replace the iframe code with your own embed code
3. Be sure to include the iframe attribute webkitallowfullscreen mozallowfullscreen allowfullscreen in your iframe tag (Refer to example below)

<iframe src=”http://superstorefinder.net/clients/responsive/embed.php” width=”100%” height=”1180px” scrolling=no frameborder=no allowtransparency=”true” webkitallowfullscreen mozallowfullscreen allowfullscreen></iframe>

Step by step guide available in this YouTube video