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Have used the D7100 and D500 to take video (don't have a D750). First you put it in live view (which sounds like you did?) by turning the knob in the back and then the mirror is up and the screen in the back should show what is in front (ie. the view finder no longer works since mirror up). But you don't use the shutter release to start taking video. Instead of pressing the shutter button, you press the button on top next to it that has a red dot. Try that and let us know if it works to start the video recording.
Welcome to BCG!
Thank you ButlerKid.
Have fun! I found it best to do video on a tripod and then try to take video of something that isn't moving a lot. Also try using a small aperture to increase the DOF (which is often necessary anyway since the shutter speed should normally be only twice the fps.) So if you shoot at 30 fps/ then the shutter speed should be 1/60. Show us some of your videos when you get something you like!
