Note:  There is a video version of this text article, with the same name, in Playlist "How To Make Home Videos".
This app can change MANY DSLR settings.   This video will cover ONLY the settings MOST people need to use.  For further info, consult the latest User's Guide for your camera, and the User's Guide for the App.

Here's how remote shooting with the EOS Utility app will help you record a video:
⦁    Tip:  Use remote shooting with the camera on a tripod.
⦁    Use it before recording yourself.  To adjust lights to eliminate reflection from your glasses, to check your appearance, and to check your position within the scene.
⦁    Preview a video scene where you will walk around while recording. You can check the focus and ensure you won't be "cut off" in the scene. (i.e. video showing you working on a home improvement project.)  I switch to snapshot mode to set the best focus, then set the lens to MF so the focus won't change while shooting the video.
⦁    You won't have to run to get into a group picture, as you did when using the camera's shutter delay timer.
⦁    To take perfectly timed snapshot of a bird feeder, animal burrow or your children playing.

Windows Computer:  The "EOS Utility" app gives you complete control of the camera, including remote viewing, focusing, and taking pictures or videos.  The T6i connects to the computer with a USB cable.
Here are the steps to use the EOS Utility
⦁    Download and install the app from the Canon webpage .  It is NOT available from the Windows App Store.  
⦁    Set the camera lens AF/MF switch to AF(auto-foccus).  Set shooting mode to P to avoid spending a LOT of time tweaking the camera settings.
⦁    Open the LCD display screen.
⦁    Turn on the camera.
⦁    Turn OFF the camera's WIFI:  
Press "menu", select the first wrench on the menu display,  disable Wi-Fi/NFC.
⦁    Close The LCD display screen.
⦁    Turn off the camera.
⦁    Connect the camera to the computer with a USB cable.  I suggest an ACTIVE USB 3.0 cable (20 ft. or more) for shooting flexibility and for multiple cable uses.  (Non-active USB cables longer than 10 ft. may not work.)
⦁    Turn on the camera in snapshot mode, NOT movie mode.  The EOS app should turn on automatically.  If not, recheck that Wi-Fi/NFC is DISABLED.
⦁    Select "remote shooting".  The control popup opens with the camera in snapshot mode.
⦁    Click the movie camera icon at lower right to switch between video mode and snapsho mode.  (If you set the camera on switch to the movie position, the app can't switch between movie and snapshot mode.)
⦁    Zoom - Sorry, folks.  You'll have to use the zoom on the camera.

In movie mode (live view window)
Exposure adjusts automatically as the camera moves

Under "Focus":
⦁    Click in the first box to selet focusing mode.  I recommend FlexZone - Single.
⦁    Click "on" to autofocus.  (Turns off after 4 secs.)  You can drag the focus grid in the window.
⦁    Movie Servo AF - check box to cause camera to continuously autofocus while composing or shooting a movie.  This may produce a confusing video, and will run down the camera battery quickly.  I recommend you don't check this, and click "on" to focus.
⦁    Click the left or right arrows to manually change focus.  (Movie Servo AF must be unchecked.)

⦁    Press the red dot at lower left to start/stop video recording.

In snapshot mode(EOS window):
⦁    Hover the cursor over the black knob at the top to focus the camera
⦁    To turn on continuous AF, check box, then press "on".
⦁    Click the black knob to take a snapshot

Controls below live view window (left to right):
⦁    Arrows to rotate view 90 degrees left or right
⦁    Display focus grid
⦁    Change aspect ratio (recommend 16:9 for YouTube)
⦁    Magnify focus area for fine focus