Hi,
I found that if you get your SD card, make a folder called"DCIM", open another folder called "100NIKON", then put the video in there
Rename it to DSCF0001 and see if it's detected, it sees my camera like that, and the cameras video files.
I did as above and imported various pictures, it didn't detect any pics until they were renumbered as above, if you use windows rename
Please remember, it won't detect any hyphens, quotes or () etc...eg DSCF (1).jpg, DSCF (2). Jpg won't be seen so you need to change them.
Hope this works