Capturing Translucent Windows
Windows which are transparent or semi-transparent are called "Translucent Windows". The most commonly seen translucent windows are Notifications, displayed by programs that are in the Windows System Tray. By default, all the translucent windows are captured. However, items like Notifications and the Office Assistant may not be significant to the function you are illustrating with your screen recording. So you can disable the capturing of translucent windows.
Click Tools >> Settings >> Recording. Disable the option Capture translucent windows.
Note: If the Capture translucent windows option is enabled, the mouse pointer blinks when recording is in progress, but not in the recorded video.