That was a great video, one of the basic requirements of nature photography is the equipment to capture the subject and know how to use it to the maximum.  The second is patience and the third as was pointed out is lots and lots of planning.  Even with all of that there is still a degree of good luck which works for you because of the devotion of the previous.

A number of years ago in an attempt to capture a specific fish hatching in the outer Fiji Islands a number of us took shifts underwater waiting on the eggs to hatch, we spent  hours underwater each day for almost a week poised with cameras just waiting, amazing how the cold penetrates a wetsuit when you don't move around.  Lots of planning to be on a remote reef in the Pacific, really great camera equipment with full Nikon support staff, lots of patience, and in the end ... no photo.  That is nature photography! mark