You tell the framework you wish to use the accelerometer with this one call inside any Layer class:

Device::setAccelerometerEnabled(true);

Then, just as you've done with touch events, you subscribe to the accelerometer events from the event dispatcher as follows:

auto listenerAccelerometer =  
EventListenerAcceleration::create(CC_CALLBACK_2 (GameLayer::onAcceleration, this));
_eventDispatcher->addEventListenerWithSceneGraphPriority(listenerAccelerometer,  this);

In Eskimo, the accelerometer data changes the value of a Point vector called _acceleration.

void GameLayer::onAcceleration(Acceleration *acc, Event *event) {
    _acceleration = Vec2(acc->x * ACCELEROMETER_MULTIPLIER,
                        acc->y * ACCELEROMETER_MULTIPLIER);
}

This value is then read inside the main loop and used to move the Eskimo. In the game, only one axis is updated...