OpenCV 5 Image & Video I/O: imread, VideoCapture, VideoWriter
Learn OpenCV 5 image and video I/O in C++ with imread, imwrite, VideoCapture and VideoWriter—including silent-failure checks and complete code.
OpenCV tutorials with code that runs.
113 C++ and OpenCV tutorials written since 2015 — video streaming with GStreamer and FFmpeg, object detection and tracking, and the modern multimodal models. Every one of them includes the complete source.
Latest tutorials
All 113 tutorials →How to Install OpenCV 5 on Windows and Linux (CMake + MSVC)
Install OpenCV 5 on Windows or Linux using binaries or a CMake source build with MSVC, contrib modules, C++17 and a simple verification program.
OpenCV Image Transformations in C++: Resize, Crop, ROI, Filters
Learn OpenCV image transformations in C++: resize, crop, ROI, blur, Gaussian filtering and Canny—plus when shared cv::Mat data requires clone().
OpenCV cv::Mat Memory: Shallow Copy, clone and copyTo
Understand cv::Mat memory in C++: headers, shared data, reference counting, shallow copies, clone(), copyTo(), pixel access and safe image I/O.
Why I Stopped Relying on OpenCV’s VideoCapture, And You Should Too
Have you ever spent hours debugging a stuttering 4K stream, only to realize that OpenCV’s cv::VideoCapture was not the best performing option? I’ve been…
FFmpeg 8.1 'Hoare': The End of PCIe Bottlenecks with Vulkan Compute
The Evolution of GPU-Resident Pipelines: A Look at FFmpeg 8.1 "Hoare" Have you ever spent hours waiting for a high-resolution video transcode to finish…
Secure Vertex AI: Restrict API Tokens by IP [Tutorial]
Many Generative AI APIs allow you to restrict an API key or token to specific IP addresses, like Vertex AI, Google AI studio.
C++ OpenCV Object Tracking: Tutorial + Source Code [2025]
single target tracker tutorial in under 60 lines of C++. i will use a "select-and-track" approach where you can simply draw a box and track object
Recently revised
Mastering OpenCV: Read IP, Web & Video Streams [2025]
Updated Feb 20, 2026
Build OpenCV 4 + FFmpeg on Ubuntu 22.04 [Solved]
Updated Feb 20, 2026
[Source Code] Kalman Filter for Video Head Tracking
Updated Feb 20, 2026
[2025] Testing OpenCV 4 DNN with YOLO v2 Tiny
Updated Feb 20, 2026