I was able to import videos directly from my canon 5d mkii into lightroom on my macbook pro 2015. Now iphotos, bridge and Lightroom show me an error when I try to import videos from 5d. Photos import perfectly fine, just not video. I tried to import the same videos into my pc's Lightroom and they import fine. I need to import into my mac again! Please help.
It seems an issue with the destination folder, so I would suggest you to check if you have Read and Write access of the destination folder where you are trying to import the images.
Also try to change the location of the destination folder, and then import the videos in Lightroom.
Let me know if it helps.