Camtasia is a screen recording and video making solution designed to create, edit, and share videos. By using Camtasia, you can add music effects, video effects, notes, annotations, and other effects to the recorded video. 

Advantages

• Looks professional.
• Good video manuals.
• Picture in Picture (PiP).
• You can import other videos.
• You can export in different formats.
• Videos can be adjusted in for example size.
• You can use several audio tracks.
• You can record a powerpoint.
• You can add quizzes to the video.

• Not free. 
• Many possibilties, you could get lost.
• Installation needed.
• Can look intimidating to begin with.

Manual? You can find it here.