I was searching for ways to record video of all my League of Legends games. Going through different forums and everything until I found a really useful tool. I have used it a couple times, and if you're computer is not so high performance like mine, you are able to capture, record and share every moment in your game for free! This will not affect your performance.
It is really quite easy, you basically need to do two things.
1. Download and install the League of Legends replays – This runs in the backgrounds and records / saves everything. Make sure you have it running in the background when you are in a game. This will record every single moment that happens. When you replay it, you are able to scroll around and view everything. There is a slow-motion button, as well as fast forward and pause. The only thing missing is a rewind button. Google LOLReplay and click the first link for a download.
2. Download and install a free version of Fraps – This only lets you record 30 seconds at a time, so you will need to put them together in a movie editor program. I personally use Windows Movie Maker. When you run the replay, Fraps moments that you think are good and deserve the spotlight. You can also keep clicking the record button if you wish to record the whole game. It will then save all the files in your Fraps / Movies folder. Open them in the Windows Movie Maker and edit it the way you prefer. Google fraps download for the download.
This is only needed if you wish to share with other people via YouTube, or any other video sharing sites. If you only need to view the replays for personal gain, then this is not needed. I have tested this method and it works quite well for being a free method. You can also use other recording software such as HyperCam, but I have had better success with Fraps. If you do not have Windows Movie Maker, or would prefer an alternative, Ulead, Honestech and Power Director are similar and will not break the bank. This software does cost a small amount. So if you wish to stick to a free method, I strongly suggest using Windows Movie Maker,
Although perhaps also want to check into VirtualDub, it is a free editor that lets you cut, reverse, flip, resize, and apply other special effects to .avi files. It is great for cleaning up videos before introducing them into the timeline.
You are able to make a league of legends guide and upload them on YouTube if you love sharing your pro moments!