Comment by notpublic
Indeed! I just found out about tmux display-popup recently.
# ~/.tmux.conf
bind-key C-g display-popup -E -d "#{pane_current_path}" -xC -yC -w 80% -h 75% "lazygit"
Then, in tmux: ctrl-b ctrl-g will open a popup window with lazygit
q to quit
Pretty much my config exactly. I make mine a bit bigger tho: