The following paper studies digital image and video watermarking using neural networks:
A Study on Digital Image and Video Watermarking Schemes using Neural Networks, B. Isac and V. Santhi, International Journal of Computer Applications, vol. 12, no. 9, Jan. 2011.
The following work includes information about watermarking capacity:
Image Watermarking Capacity Analysis using Neural Network, F. Zhang and H. Zhang, Proceedings of the IEEE/WIC/ACM International Conference on Web Intelligence (WI’04), Beijing, China, 2004.
Using ANN in watermarking applications depends on how your ANN design be suitable for compressing data before embedding and its applicability for deciding the best locations in host to embed the data