Landscape-only video capture (ideas)

This is a series of ideas related to allowing filming with a phone only when it is held in landscape mode, avoiding the vertical video syndrome.

1. Allowing the use of the phone camera only in landscape mode
Let's say you want to shoot a video with your phone and you press the camera button when in portrait mode, but the phone tells you that you can't do it on portrait mode. Then you turn it sideways, tap the camera button again, and volia! you are finally shooting a video.

2. "Turn the phone to start shooting"
TBA