I found good apps to auto hide the mouse when the mouse is idle. It seems that the mplayer does not hide mouse when it was playing full screen. You can try hide the mouse yourselft by moving to bottom left corner but you will still see a white bright dot which can be annoying something. Well, rejoice unclutter will solve that problem.
Download the rpm from the link provide and install either by terminal or double click on it (prefer double click on it, ydl will download any dependency files to install unclutter)
You can run the unclutter in three ways:
1. just type unclutter and press enter in the terminal window
2. just type unclutter & and press enter in the terminal window. The & tell linux that you want to run it the background
3. you can auto run unclutter everytime you login by insert unclutter & in your .bash, .bashrc or .bashprofile file in your root folder. I can't remember exactly which one. It will have some comment mention about startup or auto load.