Analog Video PCB Layout
DRC checks for analog signals depends on impedance.  VGA/NTSC ports are usually 75ohms and impedance of copper tracks can be made to match if necessary but only affects frequency range where prop delay of path length is significant part of rise time. controlled ground plane impedances are normally not done for Video signals as F is too low. But power supply noise is a concern and phase/pulse noise rejection in amplifiers. So adequate decoupling / regulation for analog circuits is important. Propagation delays depend on dielectric constant but generally Average Propagation Delay= 2 nS / ft so not critical  for most Video signals.