Elizabeth:

The most effective and simple way to make the videos:

you can open the camera and say I am XXX. I am going to demonstrate the new features of the product XXX. Second, you can turn off the camera and show the PowerPoint slides. Meanwhile, you read a prepared script to introduce the features. At the end of the video, you can open the camera and say I am XXX. This is my information (put your contact information as a subtitle), and please contact me if you have any questions.