Many modern applications use video analysis, and in particular motion analysis, to achieve different purposes, from motion recognition to motion prediction. In this regard, a common interest is to speed up the extraction of this type of data, in the form of motion vectors, from the most commonly used video standard: the H264 Standard. The typical H264 decoders, in particular FFmpeg, decode the entire video to extract the motion vectors - a process that is highly expensive in terms of timings. For this reason, the thesis studies the possibility of building an enlightened version of a decoder composed only of the necessary parts for motion extraction (mainly entropy decoding).