If your nvidia drivers are working, TV-out should work without the need of any addition application, only a little tweaking at your
/etc/X11/xorg.conf file. Here is an example of things that I've added in order to get TV-out with an old nvidia geforce 4 MX 440.
Code:
Section "Device"
Identifier "VESA Framebuffer"
# Driver "vesa"
Driver "nvidia"
#VideoRam 4096
# Insert Clocks lines here if appropriate
Option "Rotate" "off"
Option "TwinView" "true"
Option "SecondMonitorHorizSync" "30-50"
Option "SecondMonitorVertRefresh" "60"
Option "MetaModes" "1024x768,1024x768;800x600,800x600;640x480,640x480"
Option "TVStandard" "Pal-B"
Option "ConnectedMonitor" "CRT,TV"
Option "TwinViewOrientation" "Clone"
Option "TVOutFormat" "SVIDEO"
EndSection
This should slightly change from one country to another, as NTSC, Pal-B, Pal-G, etc... TVOutFormat might also change. You may want to check nvidia's homepage for more info.
Regards!