Canon EOS 70DN Basic Instruction Manual page 416

k Shooting Movies
Autoexposure Shooting
When the shooting mode is set to other than <a>, autoexposure
control will take effect to suit the scene's current brightness.
Recording movies
Microphone
252
1 Set the shooting mode to a mode
other than <a>.
2
Set the Live View shooting/Movie
shooting switch to <k>.
The reflex mirror will make a sound,
then the image will appear on the
LCD monitor.
3
Focus the subject.
Before shooting a movie, focus with
AF or manual focus (p.233-248).
When you press the shutter button
halfway, the camera will focus with
the current AF method.
4
Shoot the movie.
Press the <0> button to start
shooting a movie.
While the movie is being shot, the
"o" mark will be displayed on the
upper right of the screen.
To stop shooting the movie, press the
<0> button again.