e.g. click on a button (not browser resizing) which changes the size with css directly or adds a different CSS class to it,
then you should call
jQuery.fn.axZm.resizeStart(3000); when it starts resizing
jQuery.fn.axZm.resizeStart(1); when it definitely ends.
No need to do this if your responsive layout is resized by window resize or orinetation change events, AJAX-ZOOM will do it instantly then.
Also please note that among many, many other settings and design restyles you can also this black tollbar under the player and a different one if you want. Please also take a look at example33_responsive.php with hotspots made with hotspots configurator (example33.php).