Wiki: show author contribution percentage / text-highlight what parts who wrote

In order to allow visitors to work out how reliable information in Wiki articles are, I would like to be able to show them who wrote what parts of each article, or at least how much the different authors have contributed.

Would it be possible for the plugin to compare the current version of an article with the historical snapshots that it keeps in the History tab, and then output for example a nice table with a percentage next to each contributor's name? Or have the list of authors below the article with different colours next to their names, and then visitors could click the author name to highlight that author's contributions in the Wiki article text?

I would be quite happy to pay towards the development of this custom feature, if it were possible!