I made a video about the best settings for video for Olympus. I had Olympus OM-D E-M1 MKII the example camera. But of course the other Olympus cameras are very good in video too.
The basic settings are the same. The Movie setttings in the menus are in different places. In the OM-D E-M5MKII the movie menu can found in the Special menu I. The same goes with the Pen-F.
The Pen E-PL9 has its own video menu like the E-M1 MKII. Remember to use M-IS 2 setting with the stabiliser in the Pen E-PL9. It will turn the digital stabilising off. The OM-D E-M10MKII has a very similar menu system as the Pen E-PL9.
From this video you get idea and understand the terms better. If needed read the settings from the manual. If you do not have it try find it from Olympus website.