Blurring Out Overlay Text From Video Using Avidemux.

You must select a video format to apply a video filter (the video must be transcoded). Also, make sure you select a format from the drop down which includes audio in the description. Otherwise it will drop the audio from the video.

Select filters from the drop down menu.

Select the Miscellaneous filter Mplayer delogo.

Adjust the position and size of the filter area.

A filter must be applied for each area that needs to be hidden.

Apply filter to all areas that need to be blurred.

Save the video. Click the disk icon or select File/Save/Save Video from the drop-down menu.

The overlay text is now blurred out.