The events are tied to the browser events on the Window of the app. I don’t know enough about web if it’s possible to also listen to browser input events from the parent
If it is possible, then you could change the orbit camera input to listen to the browser raw events instead.
Another alternative is to have the app as a canvas and the ‘parent’ page all on one page instead of an iframe.
See Embedding PlayCanvas into a webpage without iframe - #28 by Cheburashka for ways to do that.