Is it possible to get width and height of a hotspot if those attributes are NOT set

I have some image and video hotspots that I am using as image and video popups in VR Devices. It looks like the following (a video popup):

Here I want to place a close button top-center but the problem is that I am not able to position the close button based on height of the popup as I am not setting any explicit width/height for popup, it has to be based on the image/video original size.

My question is, is it possible to get native width/height/bounding-rectangle of a hotspot to calculate the position of the close button like ath + height/2 or so?

Any other idea to solve this close button position is also obviously a great help. I saw that layers or parent-child has issues in VR thats why I am trying flat / single level of hotspots.

This is the code I use to add close button: hotspot[popup] is the video/image popup shown in above image

<!-- ADD CLOSE BUTTON -->
          addhotspot(popup_close);
          set(hotspot[popup_close].url,'https://....../close.png');
          set(hotspot[popup_close].distorted,true);
          set(hotspot[popup_close].alpha,0);
          set(hotspot[popup_close].edge,bottom);
          set(hotspot[popup_close].depth,900);
          set(hotspot[popup_close].tx,0); 
          set(hotspot[popup_close].ty,-300); <!-- Calculate using hotspot[popup].nativeHeight??? -!>
          trace(get(hotspot[popup].width));
          set(hotspot[popup_close].ath,get(hotspot[popup].ath));
          set(hotspot[popup_close].atv,get(hotspot[popup].atv));
          set(hotspot[popup_close].onclick,removepopuphotspot());
          tween(hotspot[popup_close].alpha,1, 2);

Peace,