7D video recovery on mac operating system is not a difficult task. You should check your backup file for lost videos. If you are using advanced Mac versions and time machine feature of the system is on then you can also check time machine database for lost videos. Run disk utility tool. It can solve system problem and quite possible that your lost videos get back automatically. However, if all these suggestions are just useless for you as it may happen in severe damage situation then use professional Image recovery Mac tool that can recover images and video files from Mac system.