You might be able to use one of the Flash browsers. They work by using a remote server to access and reserve the site. The server usually has all the normal plugins, so Active X has a chance of working. All the apps tend to be a bit unpredictable and slow, but that probably won't be much of a problem with cctv.
Most popular (last I checked) apps are: iSwifter, Puffin, Skyfire.