Hi and welcome to the forum,
You have already done the big job and finding the rtsp which usually is the trick. So in Webcam7 right click on the video image and select source settings
and in source configuration set protocol to rtsp_tcp and in Address enter
If you use the filer for several sources you also need to tick the check box for Multiple Instance Support.
If the url is correct you should have the video.
However, I would very much recommend you to use Netcam Studio instead which is much more adapted to work with IP cameras and have a very nice new web client. More info and download you find here http://community.netcamstudio.com/t/netcam-studio-1-4-1-netcam-studio-2-0-beta/1799/3 In Netcam Studio you just add the camera using the tab Custom URL. and set stream type to rtsp_tcp. Or better, since your camera seems to support onvif use the tab onvif.