Has FAQ & Troubleshooting information.
Based on quick reading, I would say Fusion Drive is probably not a good option for serious video capture, they already address a problem with this, in the support information, and consumers haven't had it for more than a day or so yet!
Quote of section I am referring to:
"I'm using video capture software and it reports frame drops during sustained captures. What could be wrong?
Your project's capture requirements may exceed the sustained capture rate available to your Fusion Drive. Try capturing a smaller segment of the source or reduce its resolution."