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For this short tutorial I will take as example the normal map I created for the sewer cap in the previous tutorial about the floaters.
Go in the Channels of your normal map, select the green channel, do Ctrl-C, and paste it in the layers. Name this new layer Green.
Once you are done, hide the red layer, unhide and select the green layer. Go in Filter / Stylize / Emboss and choose -90.
Set your red layer in overlay, merge the two layers together by doing Ctrl-E. Your cavity map is now finished. You can use it on top of your diffuse texture, set it in overlay and you might need to reduce the opacity.