How do I export the video with the actor only coupled with a transparent background?

For Windows OS: -
1) Export the "image" in "sequence" with either "TGA" or "PNG" format.
2) Then use video editing software, eg: Photoshop, Premiere & etc, to compose the images to a video.

For Mac OS: -
1) Export the "video" by selecting the "Apple ProRes 4444" video codec.
Note: The "Apple ProRes 4444" option is only available for CrazyTalk Mac OS version 10.7.5 or above.