That depends if they are in the correct format. Your post doesn't tell us that.
Supported formats are:
H.264 video up to 720p, 30 frames per second, Main Profile level 3.1 with AAC-LC audio up to 160Kbps per channel, 48kHz, stereo audio in .m4v, .mp4 and .mov file formats
MPEG-4 video, up to 2.5Mbps, 640x480 pixels, 30 frames per second, Simple Profile with AAC-LC audio up to 160Kbps, 48kHz, stereo audio in .m4v, .mp4 and .mov file formats
Motion JPEG (M-JPEG) up to 35Mbps, 1280x720 pixels, 30 frames per second, audio in ulaw, PCM stereo audio in .avi file format