What are some ways to hide some information in the video? because just visual inspection with your eyes of the frame, are there some generic methods (similar to audio spectogram) that can beused to try and extract some stuff? I already went through frameplotter and bitratre plotter, did some color adjustments but it is all child's play.

What are more advanced way to hide some data, which I can use in reverse on target video? or just general concepts.