Using vim-surround With A Visual Selection
The vim-surround plugin allows
you to do a variety of actions that have to do with the surrounding
characters of text objects.
The S keystroke allows you to surround a visual selection with the
following character.
First, make a visual selection. Then hit S. Then hit a surround character
such as ( or [ and the area of text that has been visually selected will
be wrapped with the respective surround characters.