zsh-togglecursor

This plugin toggles cursor when switching between the vi command (vicmd) and insert (usually main) keymaps.

Requirements

zsh

Version 5.3 or higher is required.

Terminal

The terminal application that understands DECSCUSR, which fixes the style of the cursor. Terminator, Konsole, iTerm2, Apple Terminal, and Konsole are known to support the feature.

tmux

This plugin also works inside tmux if it is properly configured. Add terminal-overrides to your tmux.conf as follows:

set -ga terminal-overrides ',*:Ss=\E[%p1%d q:Se=\E[2 q'

Note: This was taken from FAQ · neovim/neovim Wiki