You need to be a bit more specific, what is your video format exactly? Composite video? A camera datasheet would help here.
Similarly what do you mean by "single conductor wireline" - coax? twisted pair? bellwire? wet string? Again, a datasheet for the cable would be good.
Yes you almost certainly need to amplify it at the camera end as a minimum, though opamps are not a good choice here. It may also be sensible to modulate or otherwise manipulate the signal depending on the line characteristics.
If it is a composite video signal sent over coax for example then you would be best modulating it onto an RF carrier, that moves your signal from 0-5 MHz to, say, 400-405 MHz so the signal is less dispersed (because the fractional bandwidth is less) and allows you to use the highly sensitive RF input on a standard unmodified TV.