Repository: opencv
Issue: Viz3d::setCamera causes uninitialized OpenGL API calls
Labels: category: viz

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##### System information (version)
<!-- Example
- OpenCV => 4.2
- Operating System / Platform => Windows 64 Bit
- Compiler => Visual Studio 2017
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- OpenCV => 4.5.1
- Operating System / Platform => Windows 64 Bit
- Compiler => Visual Studio 2019

##### Detailed description

<!-- your description -->
`VizImpl::setCamera` calls `vtkRenderer::Render`, which will call `vtkOpenGLRenderer::DeviceRender` even if OpenGL is uninitialized.
According to the [vtk documentation](https://vtk.org/doc/nightly/html/classvtkRenderer.html#adc877bbb1ff9a92e36146f7e379815d5), `vtkRenderer::Render` is

> CALLED BY vtkRenderWindow ONLY.

The documentation and a vtk [example](https://kitware.github.io/vtk-js/examples/DeviceOrientationToCamera.html) show that `vtkRenderWindow::Render` is the correct procedure to be called after `vtkRenderer::resetCameraClippingRange`.
Some examples([1](https://answers.opencv.org/question/171647/adjusting-viz-camera-parameters-yields-stuttering-effect/), [2](https://answers.opencv.org/question/192444/viz3d-setcamera-only-works-the-first-time/)) can be found that use calling `Viz3d::spinOnce` before `setCamera` as a workaround.

##### Steps to reproduce

<!-- to add code example fence it with triple backticks and optional file extension
    ```.cpp
    // C++ code example
    ```
 or attach as .txt or .zip file
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```.cpp
int main()
{
    cv::viz::Viz3d viz("hoge");
    cv::Size size(1200, 900);
    cv::viz::Camera camera(2.0e+4, 2.0e+4, size.width / 2.0, size.height / 2.0, size);
    // viz.spinOnce(); // workaround
    viz.setCamera(camera);
    return 0;
}
```

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