The watermarking is a technique that gives protection to multimedia data such as images and video. Actually, their protection from malicious manipulations as unauthorized copying and illegal distribution becomes a necessity. A simple re-used of still images watermarking techniques for video watermarking are not sufficiently efficient. In fact, if the mark is embedded in every frame of the video without taken into account the strong temporal correlation between them, a simple temporal filtering can destroy this mark. In this paper, we present an adaptive video watermarking using mosaic images which resists this attack. This method is also tested against MPEG compression.