windows: fix video apply settings bug

Refs #72539

Change-Id: I2c7f3e1375d104db89188763bcafa6e78fe49891

src/media/video/winvideo/video_device_impl.cpp

@@ -237,12 +237,14 @@ VideoDeviceImpl::applySettings(VideoSettings settings)
 {
     if (!settings.video_size.empty()) {
         auto pmt = capMap_[settings.video_size];
+        if (pmt != nullptr) {
             ((VIDEOINFOHEADER*) pmt->pbFormat)->AvgTimePerFrame = settings.framerate;
             if (FAILED(cInterface->streamConf_->SetFormat(capMap_[settings.video_size]))) {
              RING_ERR("Could not set settings.");
             }
         }
     }
+}
 
 DeviceParams
 VideoDeviceImpl::getDeviceParams() const