Right now, with Oxygen 2.0, only the menu can be sticky.
How about to make any page element to be sticky as well, like this image ?

Step 1
Go to this page and download the compressed version of the file : http://leafo.net/sticky-kit/
Step 2
Add the JS to your enqueue files :
wp_enqueue_script( 'sticky-js', plugin_dir_url( __FILE__ ) . 'assets/js/jquery.sticky-kit.min.js', array('jquery'),'', false);
Step 3
Now just add this code to the element you want to be sticky. It can be a section, a div, an image...
(function($) {
$('#%%ELEMENT_ID%%').stick_in_parent();
}(jQuery));
You can specify which parent the element will be stick to. For an image :
(function($) {
$('#%%ELEMENT_ID%%').stick_in_parent({parent:'body'});
}(jQuery));
The element must be inside a section or a div.
Example with an image : I put the image inside a DIV, then I select the Image and I add the code :

When the element is sticky, the "is_stuck" class is added to it.
So we can add some CSS :
img.is_stuck {
opacity:0.7;
transition:1s ease opacity;
}
Check the Fullscreen sticky page for a better example : https://oxygen4fun.supadezign.com/fullscreen-sticky-page/