Over the years the Micro Four Thirds system has been heavily advanced by both camera manufacturers and lens manufacturers. It's possible to get more out of certain lenses by using new Focal Reducer, Speed Boosters, or Lens Turbo adapters for manual lenses. There is of course an adapter to mount a Canon EF to an M4/3 body, but it will not allow control of the iris.
If you have your heart set on trying to adapt a Canon EF lens to an MFT M4/3 camera, Raymond Leung writes in and shares his experience with the Canon EF to M4/3 adapter. He's posted a few sample images using this Canon EF to M4/3 adapter with an Olympus camera. You should be able to gauge how well this will work in video mode. You can see some of those results at his blog (found here)
Canon EF Lens to M43 MFT Micro Four Thids Adapter