You're not alone. We all have dealt with this plugin issue one way or another. I suggest installing the add-on for Internet Explorer, and view with internet explorer. You can also try Mozilla Firefox or install an extension for Google Chrome called IE Tab. Make sure to install the extension / add-on / plug-in for camera interface first.
Note: This is not really a fix. Much of these solutions are temporary until future security patches are made. Clearly, these camera manufacturers need to revamp the way they allow us to login to view the cameras.