Canon EOS M200 Advanced User's Manual page 201

(1)
You can lock the exposure (AE lock) by pressing the <A> button. To cancel,
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press the <A> button again. (Retained until the <A> button is pressed again.)
Exposure compensation can be set in a range of up to ±3 stops.
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ISO speed, shutter speed, and aperture value are not recorded in movie Exif
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information.
ISO Speed in [k] Mode
ISO speed is set automatically. For details on the ISO speed, see = 501.
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Record the movie.
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( 2 )
Press the movie shooting button to start
recording a movie.
While the movie is being recorded, the
[oREC] mark (1) will be displayed on
the upper right of the screen.
Sound is recorded by the microphones
at the positions indicated (2).
To stop recording the movie, press the
movie shooting button again.
Movie Mode
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