In this paper we propose an effective, robust and imperceptible video watermarking algorithm by applying DWT (Discrete Wavelet transform) on video frames. The video frames will be first decomposed using DWT and the binary watermark will be embedded in the wavelet coefficients. The experimental results demonstrate that the propose algorithm can produce watermarked contents in good visual quality and is robust to typical video operations.DWT is used to embed the invisible watermark and Peak Signal to Noise Ratio (PSNR) will be calculated to measure efficiency of this method.