With the Atomos External Monitor recorder, you can record any camera screens. The example in the video features the Atomos Ninja Assassin and Sony a7S II. One thing to note, the Assassin is a 4K External Recorder with better on-screen resolution than that of the Ninja 2 which can only shoot 1080p with a lower on-screen resolution. Again, the Ninja 2 should be suffice if you're only planning to record your screen only.
Shopping List
Atomos Ninja 2 ($295): http://geni.us/AZ3fAdj
Sandisk SSD* ($80):
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