Nikon d750 external power supply?

I recently purchased my first dslr for film making, i went with a Nikon d750, now what i would like to connect a third part external power supply, what type should i be getting as the nikon doesn't seem to have the right inputs for it.

Here is the link to the Nikon brand external power supply

Do yourself a huge favor and do some testing with the d750 while you still have the ability to return it for a full refund. Pay particular attention to it's ability to auto focus when making a video. I've not used one, but Nikon has the worst reputation for its video performance. One reviewer called their AF performance appalling.

Of all DSLRs and mirrorless cameras on the market, when it comes to video, Nikon is at the bottom. If your main use is video, and you don't care much for it's photographic abilities (which are great), you'd be far better off with a Sony A7 series or a Panasonic GH4.