How to get a video copied onto your iPhone 5 photo library?

I want to copy video files from my pc computer to my iPhone. Do I have to convert them to MP4? If so where do I go from there? How can I get them to come up in my photo library?

Yes, you have to convert the video to mp4 file first, then you can add the mp4 video into your iTunes library and sync the video to your iPhone. If you don't know how to convert video, this tutorial will help you a lot.