Again I have problems, this time it is with a gopro hero 4 but now it is a little different what happens.
The red button to record video does appear on the screen and if I precede it the camera starts recording video, but after a few seconds I lose the video image, that is, the screen goes black.
The camera continues to record video but I have no image feedback.
Thanks for your answer but...
really, the problem was de video frame rate, it was set too high for my Phone's screen..that was the reason...simply the Iphone does not be able to show video at so very high frame rate