Create a smart album with the following criteria:
Filename contains .m
This will group all of your movie/video files together, .mov, .m4v, and mp4. Then check to see if the lates videos are included. If the are Command (right) - click on one of the videos and select Show Event from the contextual menu.
The the videos are not in the library launch Image Capture (located in the Applications folder) and use it to manually upload the videos to a folder on the Desktop. From there import them into iPhoto.