As you know, the ports on the TV act this way:
Video Out: Gives out the signal. This is what you can capture. The signal maybe the TV signal or from another source like a VCR
Video In: Takes signal from other sources like camcorders and VHS/DVD players. Connecting the Dazzle on this port would not give you anything to capture.
If the other TV does not have video out ports, how about replacing the Dazzle with a TV Tuner kit? Our software can also capture the TV it displays.