easyXDM is not going to faciliate your needs. In order for easyXDM to function you need it hosted on the two domains you want to communicate between. In this case you need it on both voltsoft.com and youtube.com. You can't use easyXDM here because you can't upload arbitrary HTML/JS content to youtube.com.
Generally the solution in this situation is that you either need to proxy the remote contents server-side or you need the cooperation of the remote server.