Camera Example crazy on Ubuntu 22

When I open standard  Camera Example
1) First I see error
qt.dbus.integration: Could not connect "org.freedesktop.IBus" to globalEngineChanged(QString)

And my camera's view goes crazy. On Camera Example.png you can see screenshort, but in fact I see noise, not chess board texture.

I run this example when I haven't got any cameras in my pc.

2) When I connect my camera and try video I get
Unsupported video codec

3) When I connect my camera and try photo I get
Attempting to create QWindow-based QOffscreenSurface outside the gui thread. Expect failures.
But I can find my photo at ~/Pictures/image_0001.jpg

I test my camera with Qt V4L2 test Utility. Works good. And qtv4l2 also works good.