Updated usb_camera.cpp #1
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Updated CV_CAP_PROP_FPS to CAP_PROP_FPS: In OpenCV version 4.x, the prefix CV_ was removed from the capture property constants. Therefore, CV_CAP_PROP_FPS should be changed to CAP_PROP_FPS in order to retrieve the camera's frame rate correctly.
Updated the deprecated toImageMsg() function: The toImageMsg() function is deprecated in newer versions of cv_bridge. Instead, you can directly assign the cv::Mat image to the out_msg.image field.
Updated the sensor_msgs::image_encodings namespace: The sensor_msgs::image_encodings namespace has been moved to the cv_bridge:: namespace. Update sensor_msgs::image_encodings::BGR8 to cv_bridge::ENCODING_BGR8.