I don't know what click is ... I hope it's not the name of any copyright video because you're not allowed to mention titles of any copyright material you may have downlded on this forum.

If the video is mpeg4 or H.264 (which is an advanced variation of mpeg4), then there should be no problems. At least for iTunes. For iPod, it may be a little fussier in regards to the file. You may need to convert it. See How to transfer to my iPod (& iTunes) - for video, as there's discussion about this & suggestions about free converters.