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I've put together a test ReShade configuration that adds effects to Heroes of Might and Magic V, such as "Adaptive Texture Sharpness," "SSAA" (Screen Space Antialiasing, a more advanced form of anti-aliasing), and "HBAO" (Horizon-Based Ambient Occlusion, a sophisticated ambient occlusion system that significantly improves the visuals).
You can view the screenshots here:
http://imgur.com/a/iRALt
This configuration does impact performance, but I tried to strike a balance between image quality and speed.
Also, HBAO requires DirectX 10, and DirectX 11 is even better.
Here's the link to the configuration file:
http://www.mediafire.com/download/r7v11i95sm7hrfm/bin.7z
Extract the contents into the "bin" folder. Before using it, disable anti-aliasing in the game. You can enable and disable the configuration in the game using the Scroll Lock key.