How to choose alternate I2C pins on ESP32? I'm a begginer with Arduino and this may be a basic question but I'm facing an issue.

I'm using a HTU21D sensor with an ESP32. This sensor use I2C communication. Inside the Arduino library, there is this function to start to collect data: 


//Start I2C communication
void HTU21D::begin(TwoWire &amp;wirePort)
{
  _i2cPort = &amp;wirePort; //Grab which port the user wants us to use

  _i2cPort-&gt;begin();
}


As you can see, we can set in this function which port we want to use. Perfect. But my probleme is that I don't know how to use the type TwoWire. I checked some documentation but I was still unable to find a solution. I want to use GPIO_16 as SDA and GPIO_17 as SCL. 
So I tried something like that without result: htu21d.begin(Wire(16, 17));

How to set SDA and SCL pin in TwoWire type ? (in my case GPIO_16 and GPIO_17)
I was able to resolve my issue thanks to Juraj comment. 
I did :

Wire.begin(16, 17);
htu21d.begin(Wire);