I started making videos again because I wanted to record the process of painting with an elephant when I went to Thailand in 2012. I took classes at CMCM.tv in 2013 to learn better editing skills and got hooked on the medium.
I quickly learned that there is a correct way to hold the camera to use the full screen for the video. You can see the difference in the two videos below. The top one is using the camera correctly.
Filming in the landscape (horizontal) format
Filming in the portrait (vertical) format.