c_cpp_properties.json 

{
    "configurations": [
        {
            "name": "Linux",
            "includePath": [
                "${workspaceFolder}/**",
                "/usr/local/include/opencv4/**",
                "/usr/include/opencv4"
            ],
            "defines": [],
            "compilerPath": "/usr/bin/gcc",
            "cStandard": "c17",
            "cppStandard": "c++14",
            "intelliSenseMode": "linux-gcc-x64"
        }
    ],
    "version": 4
}

task.json

这里主要看"`pkg-config --cflags --libs opencv4`"  这个地方 如果是opencv4.x版本就是opencv4，如果是opencv3.x版本的就是opencv 如果显示没有找到opencv.pc的话，根据网上的教程去写一个opencv.pc就行了

{
    "tasks": [
        {
            "type": "cppbuild",
            "label": "C/C++: g++ 生成活动文件",
            "command": "/usr/bin/g++",
            "args": [
                "-fdiagnostics-color=always",
                "-g",
                "${file}",
                "-o",
                "${fileDirname}/${fileBasenameNoExtension}",
                "`pkg-config --cflags --libs opencv4`"
            ],
            "options": {
                "cwd": "${fileDirname}"
            },
            "problemMatcher": [
                "$gcc"
            ],
            "group": {
                "kind": "build",
                "isDefault": true
            },
            "detail": "调试器生成的任务。"
        }
    ],
    "version": "2.0.0"
}