You should stop using Nikon camera to prevent new files to be written to Nikon digital camera. Because new files could overwrite the space of deleted files which may make it not recoverable. You can then follow this step by step Nikon camera data recovery solution:
how to recover data from Nikon camcorder
The Nikon camera data recovery software is easy to use, and can recover deleted photos jpg, png, jpeg, gif, raw image data, and videos, such as AVCHD, MP4, MTS, MOV, AVI and other videos from Nikon camcorder. Even after you did Nikon camcorder memory card reformat, you can still recover your lost files from Nikon camera SD card, microSD, SDHC, SDXC, SD mini, CF card.
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