.camproj

The file type .camproj isn't a video file. .camproj is a project file from the software Camtasia. 

If you have a .camproj file, use Camtasia to convert your file to a supported video file format, such as .mp4 or .mov.

If you're still experiencing problems after converting your .camproj file to a video file, verify that the following settings are correct:

Video settings:

• Compression Type: H.264
• Frame rate: 24, 25, 30, 48, 50, 60 FPS rates are preferred. Other less common frame rates like 23.98, 29.97 and 59.94 are also acceptable.
• Data rate: Automatic
• Key frames: Automatic
• Frame reordering: Unticked

Audio/Sound settings:

• Format: AAC-LC
• Bitrate: 128–256 kbps
• Sample rate: 44100 or 48000

Other settings:

• Size: Choose the original size of the video