There are lots of apps which lets you record your screen and there are apps also which lets you create animation with images but have you wonder an app which lets you record screen and save it animation.
LICEcap is a freeware app which lets you record whatever is on your screen and save it as animation. LICEcap is an intuitive but flexible application for Windows and OSX, that is designed to be lightweight and function with high performance.
In addition to .GIF, LICEcap supports its own native lossless .LCF file format, which allows for higher compression ratios than .GIF, higher quality (more than 256 colors per frame), and more accurate timestamping. If you record to .LCF, you can play back the .LCF files within REAPER.
You can generate high quality animations by keeping its size very low with LICEcap, being free is not all, it also includes its source code with download so you can improve it or make changes in it.
Using it is very easy, all you have to do is install and launch it and then you have to select the area either by stretching or by defining its size at bottom side and at last start record button.
You can pause animation in between and resume it, when you are done just stop it and you will have you animation saved.