opencv 0.53.2

Rust bindings for OpenCV
Documentation 
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use opencv::{
	core,
	features2d,
	highgui,
	imgproc,
	prelude::*,
	Result,
	videoio,
};

fn main() -> Result<()> {
	let window = "video capture";
	highgui::named_window(window, 1)?;
	#[cfg(ocvrs_opencv_branch_32)]
	let mut cam = videoio::VideoCapture::new_default(0)?; // 0 is the default camera
	#[cfg(not(ocvrs_opencv_branch_32))]
	let mut cam = videoio::VideoCapture::new(0, videoio::CAP_ANY)?; // 0 is the default camera
	let opened = videoio::VideoCapture::is_opened(&cam)?;
	if !opened {
		panic!("Unable to open default camera!");
	}
	let mut orb = <dyn features2d::ORB>::default()?;
	loop {
		let mut frame = Mat::default();
		cam.read(&mut frame)?;
		if frame.size()?.width > 0 {
			let mut gray = Mat::default();
			imgproc::cvt_color(
				&frame,
				&mut gray,
				imgproc::COLOR_BGR2GRAY,
				0,
			)?;
			let mut kps = opencv::types::VectorOfKeyPoint::new();
			let mask = Mat::default();
			orb.detect(&gray, &mut kps, &mask)?;
			let mut display = Mat::default();
			#[cfg(ocvrs_opencv_branch_4)]
			let default_draw_matches_flags = features2d::DrawMatchesFlags::DEFAULT;
			#[cfg(not(ocvrs_opencv_branch_4))]
			let default_draw_matches_flags = features2d::DrawMatchesFlags_DEFAULT;
			features2d::draw_keypoints(
				&gray,
				&kps,
				&mut display,
				core::Scalar::all(-1f64),
				default_draw_matches_flags,
			)?;
			highgui::imshow(window, &display)?;
		}
		if highgui::wait_key(10)? > 0 {
			break;
		}
	}
	Ok(())
}