 In the python [tutorial](https://youtu.be/oXlwWbU8l2o?t=701) it shows to use `cv.VideoCapture('Videos/dog.mp4)`. I have tried to search for `videocapture` in the [docs](https://docs.rs/opencv/0.49.1/opencv/videoio/enum.VideoCaptureAPIs.html?search=videocapture) but I couldn't quite find it. Apparently `opencv::videoio::VideoCapture` is a `Struct`. Is it by any chance `pub fn as_raw_VideoCapture(&self)`?