  Digital Watermarking is an extremely wide aspect of information security,
either by its applications, by its properties, or by its designs. In
particular, a lot of research has been made about video watermarking and it can
make it quite difficult to put into perspective the various schemes possible in
order to implement a watermarking process for a given application. This paper
presents an in-depth overview of the current video watermarking technologies
and how they each respond to certain criteria that may be imposed by the aimed
application. The goal being in first place to be able to define the desired
equilibrium point between invisibility, robustness and efficiency for an
application. Then, given this balance, being able to deduce the best location
of the information embedding as well as the method used to embed it. The
equilibrium point is to be found using the needed properties of the watermark
and by studying the threat model that the scheme will have to face. The
location describes whether the extra information should be added to the
metadata of the video, to its frames or to specific regions of its frames.
Finally, the method to embed the watermark refers to the insertion domain and
its coefficients to be altered in order to insert the wanted information.
