Not that I'm aware of, but if you did, the battery would only last around 40 minutes to 50 and would strain it severely.
The GPU is dedicated, not integrated. It has it's own components and everything it needs that a GPU would normally, thus requires a lot of power.
If you look at your charging brick, you'll find that it supplies 20volts and 10amps, I have a good feeling a lot of that power from the brick goes to the GPU directly. (Theoretically anyway).
With the first generation G750's, the internal graphics (Inside the 4700) is completely ignored. If you wanted that, (which probably wouldn't run the games anyway) you would have needed to buy the second gen or above, being the G750JM / JS / JZ
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