ENBSeries

I was curious if that was possible without using nVidia's FXAA that uses SubPixel AA, which creates severe blurring. GTA V ENB has High Quality MSAA option, which is of big help, but additional FXAA is still needed to reduce the temporal shimmering aliasing.

There is not yet done external shaders in the mod, so you may only use other wrappers for such purposes or in-game fxaa.