You could download the source code of Free Screen Recorder Pro here.
Features:
-Take ScreenShots
-Capture ScreenCasts (Avi/Gif/Mp4)
-Capture with/without Mouse Cursor
-Capture Specific Regions, Screens or Windows
-Capture Mouse Clicks or Keystrokes
-Mix Audio recorded from Microphone and Speaker Output
-Capture from WebCam.
-Can be used from Command-line (BETA).
-Available in multiple languages
-Configurable Hotkeys


 Tutorials:
 ● Page1： Free Screen Recorder Pro - Use Manual
 ● Page2： Quick Start to Record Display, Window, Region.
 ● Page3： How to Stream to Twitch, Youtube and Custom Url?
 ● Page4： Change the Language of the Interface UI
 ● Page5： Pre-start countdown and capure duration and other UI behaviors
 ● Page6： Add WaterMark, Text, Images,Elapsed?