CComment Pro comes with an integration for HWDmediashare. To enable it follow the following steps:
Create a CComment configuration for com_hwdmediashare. Login into your joomla backend and navigate to Components -> CComment -> Settings -> click on on new. From the dropdown select com_hwdmediashare and click nex. Save the config.
Go to Extension Manager -> Plugins and enable the HWDMediashare - Comments (CComment) plugin
Go to Components -> HWDMediashare -> Configuration -> Integrations -> Commenting and from the dropdown select HWDMediashare - Comments (CComment)
That is all now in the frontend under your media items you should see a comment form.