Just a query, does the address have to be an IP or can it be Canonical?
If it can be Canonical could you say host the Java applet on one subdomain, and house the camera on another using the main domain as for the security?
Namely an online server might be www.domain.com
and your home system's IP might be included in the ZONE record as webcam.domain.com, could www.domain.com
house the Java applet that pulls the home computer/subdomain feed?