Unfortunately currently that was not possible to achieve this.

Thanks Arlex, I tested the Content EasyDiscuss plugin with com_k2 and it works:
https://www.staging6.tecnoseguro.com/noticias/cctv/hilook-colombia-hikvision-videovigilancia-rendimiento

It creates the discussion in the selected category of the forum

Ops, I am sorry that i didn't explain further in my previous reply, what i mean is currently that is not possible to exclude which K2 categories.

May i know which setting you can able to select certain K2 category regarding this?

Hi Arlex,
The plugin works with K2 but is not possible to exclude or select categories. I have tested the exclusion of articles by ID, and it works with K2. Also I have noted the plugin creates the discussions with a page load of the K2 articles, I think the discussion should be created just after a first post to avoid create a lot of discussions in the forum without any real question. Also I think is missing an option in the plugin to enable the polls.

Just some suggestions

Thanks for your suggestion, perhaps you can submit this suggestion in our feature request page https://stackideas.com/forums/easydiscuss/feature-requests , we will prioritize this suggestion during the development process for the next major version of Easydiscuss if there are more people request on this.