Line history viewer - Git

Maybe annotations in IntelliJ IDEA is that you are looking for:

Showing and hiding annotations

1. Open the desired file in the editor.
2. To show annotations, right-click the left gutter, and select Annotate:
   
3. To hide annotations, right-click the annotations gutter, and choose Close Annotations.

I know only the IntelliJ IDEA "Viewing Changes History for Selection" feature.

You could also try to use several git blame commands to iterate over history of a fragment.