Replace QCameraViewfinder with QVideoWidget in Qt 6 - qt

Question

I am trying to port some code to Qt 6's reworked QtMultimedia framework and running into a lot of issues of disappearing APIs.
One of these is QCameraViewfinder, which as I understand it, is a simple viewer of the current QCamera image feed.
It used to be a subclass of QVideoWidget, which still exists, and its documentation helpfully states the following:
Attaching a QVideoWidget to a QMediaPlayer or QCamera allows it to display the video or image output of that object.
player = new QMediaPlayer;
player->setSource(QUrl("http://example.com/myclip1.mp4"));
videoWidget = new QVideoWidget;
player->setVideoOutput(videoWidget);
videoWidget->show();
player->play();
Note: Only a single display output can be attached to a media object at one time.
Problem is, there is no way to do QCamera::setVideoOutput(QVideoWidget*) as that function does not exist.
Neither can I find an alternative API that connects the two.
Is this something that they forgot to provide or am I missing something?
I looked through the relevant classes' source code and documentation, but can't for the life of me find the magic incantation that's supposed to give me a simple view into a QCamera's current video feed.

Answer 1

You have to use QMediaCaptureSession:
#include <QApplication>
#include <QCamera>
#include <QMediaDevices>
#include <QMediaCaptureSession>
#include <QVideoWidget>
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
QVideoWidget videoWidget;
videoWidget.resize(640, 480);
videoWidget.show();
QCamera camera(QMediaDevices::defaultVideoInput());
camera.start();
QMediaCaptureSession mediaCaptureSession;
mediaCaptureSession.setCamera(&camera);
mediaCaptureSession.setVideoOutput(&videoWidget);
return a.exec();
}