Yes, well not for zooming but for maximizing and restoring the panel. These shortcuts may look different depending on the keyboard layout. On English layouts it's ` for the active frame, which is the frame with the thin blue border drawn around, and Shift+` for the frame under the cursor. The ` character is called acute or backtick.
If you use another keyboard layout and the ` does not work or you want to change the shortcuts, go to Edit menu -> Keyboard Shortcuts... Search for Maximize and you'll get "Maximize or Restore Active Frame" and "Maximize or Restore Frame Under Cursor".
Also, you can set zoom-in/-out shortcuts for the program monitor, but it zooms into the video and doesn't make the panel larger. Those shortcuts are not set by default.