You have picked three blocks that are not supported for HDL code generation, as mentioned in the error messages. In addition you are connecting them with matrices, which is also clearly mentioned as not supported.
You might want to try using the Gamma Corrector block out of the Vision HDL Toolbox instead of the Gamma Correction block from the Computer Vision System Toolbox. This Vision HDL block accepts and generates a pixel stream as opposed to passing the entire image in parallel. This hardware-appropriate interface will also remove the issue of matrix signals from your model.
