I was searching for methods to record video of all my League of Legends games. Going right through different forums and everything until I found a really useful tool. I've tried it a few times, and if you're computer isn't so good performance like mine, you are able to capture, record and share every moment in your game for free! This can not affect your performance.
It is really rather easy, you basically should do two things.
1. Download and install the League of Legends replays - This runs in the backgrounds and records/saves everything. Ensure you own it running in the backdrop when you are in a game LOL. This can record every single moment that happens. Once you replay it, you are able to scroll around and view everything. There is a slow-motion button, in addition to fast forward and pause. The thing missing is just a rewind button. Google LOLReplay and click the first link for a download.
2. Download and install a free version of Fraps - This only enables you to record 30 seconds at any given time, which means you will need to put them together in a film editor program. I take advantage of Windows Movie Maker. Once you run the replay, Fraps moments that you believe are good and deserve the spotlight. You can even keep clicking the record button should you desire to record the complete game. It will likely 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 should you desire to generally share with others via YouTube, or any other video sharing sites. If you just need to view the replays for personal gain, then this is simply not needed. I've tested this process and it works quite nicely for being a totally free method. You can even use other recording software such as for instance HyperCam, but I experienced better success with Fraps. If you don't have Windows Movie Maker, or would rather an alternative solution, Ulead, Honestech and Power Director are similar and won't break the bank. This software does cost a tiny amount. When you need to adhere to a Free method, I strongly suggest using Windows Movie Maker,
Although might also want to check into VirtualDub, it is just a free editor that enables you to cut, reverse, flip, resize, and apply other special effects to .avi files. It is ideal for clearing up videos before entering them into the timeline.