refactor：修改OpenCVDemo依赖OpenCV库问题

    1、构建时判断库路径是否存在，如果不存在则不构建当前工程；
    2、编译完成后自动安装依赖库到当前路径下，避免编译完成后运行失败。

OpenCVDemo/OpenCVDemo.pro

@@ -10,4 +10,21 @@
 #---------------------------------------------------------------------------------------
 TEMPLATE = subdirs
 
-SUBDIRS += VideoPlay
+# CEF 库的路径， 如果路径为空则不编译当前工程
+win32{
+    opencvPath = E:/lib/opencv_MSVC2/
+}
+unix:!macx{
+}
+
+# 判断库文件是否存在，如果不存在则终止编译
+isEmpty($$opencvPath){
+    exists($$opencvPath){
+        SUBDIRS += VideoPlay
+    }else{
+        message(<<<<<<<<<<<<<<<< [OpenCV dll] The file path does not exist >>>>>>>>>>>>>>>>>>)
+    }
+}else{
+    message(<<<<<<<<<<<<<<<< [OpenCV dll] The file path is NULL >>>>>>>>>>>>>>>>>>)
+}
+

OpenCVDemo/VideoPlay/VideoPlay.pro

@@ -40,14 +40,8 @@ qnx: target.path = /tmp/$${TARGET}/bin
 else: unix:!android: target.path = /opt/$${TARGET}/bin
 !isEmpty(target.path): INSTALLS += target
 
-# opencv需要带有ffmpeg才可以打开本地视频或者网络视频流，否则只能打开图片和摄像头
-win32:CONFIG(release, debug|release): LIBS += -LE:/lib/opencv_MSVC2/build/x64/vc15/lib/ -lopencv_world460
-else:win32:CONFIG(debug, debug|release): LIBS += -LE:/lib/opencv_MSVC2/build/x64/vc15/lib/ -lopencv_world460d
-INCLUDEPATH += E:/lib/opencv_MSVC2/build/include
-DEPENDPATH += E:/lib/opencv_MSVC2/build/include
-
 #  定义程序版本号
-VERSION = 1.1.1
+VERSION = 1.1.2
 DEFINES += APP_VERSION=\\\"$$VERSION\\\"
 
 contains(QT_ARCH, i386){        # 使用32位编译器
@@ -55,6 +49,35 @@ DESTDIR = $$PWD/../bin          # 程序输出路径
 }else{
 DESTDIR = $$PWD/../bin64        # 使用64位编译器
 }
+
+# 连接opencv库，opencv需要带有ffmpeg才可以打开本地视频或者网络视频流，否则只能打开图片和摄像头
+win32{
+    opencvDLL.files += E:/lib/opencv_MSVC2/build/x64/vc15/bin/opencv_videoio_ffmpeg460_64.dll
+    CONFIG(release, debug|release){
+        LIBS += -LE:/lib/opencv_MSVC2/build/x64/vc15/lib/ -lopencv_world460
+        opencvDLL.files += E:/lib/opencv_MSVC2/build/x64/vc15/bin/opencv_videoio_msmf460_64.dll
+        opencvDLL.files += E:/lib/opencv_MSVC2/build/x64/vc15/bin/opencv_world460.dll
+    }else:CONFIG(debug, debug|release){
+        LIBS += -LE:/lib/opencv_MSVC2/build/x64/vc15/lib/ -lopencv_world460d
+        opencvDLL.files += E:/lib/opencv_MSVC2/build/x64/vc15/bin/opencv_videoio_msmf460_64d.dll
+        opencvDLL.files += E:/lib/opencv_MSVC2/build/x64/vc15/bin/opencv_world460d.dll
+        opencvDLL.files += E:/lib/opencv_MSVC2/build/x64/vc15/bin/opencv_world460.pdb
+        opencvDLL.files += E:/lib/opencv_MSVC2/build/x64/vc15/bin/opencv_world460d.pdb
+    }
+    INCLUDEPATH += E:/lib/opencv_MSVC2/build/include
+    DEPENDPATH += E:/lib/opencv_MSVC2/build/include
+    # 自动安装依赖文件和库文件
+    opencvDLL.path = $$DESTDIR
+
+    # msvc需要配置【Custom Process Step: nmake install】或者【Custom Process Step: D:\Qt\Qt5.12.5\Tools\QtCreator\bin\jom.exe install】才生效，或者自己手动拷贝
+    # Debug和Release需要分别配置
+    # 执行之前先qmake，如果不想每次手动qmake，可以点击【工具】->【选项】->【构建和运行】->【qmake】->勾选【Run qmake every build】
+    INSTALLS += opencvDLL      # 将opencv库文件拷贝到path路径下
+}
+unix:!macx{
+}
+
+
 # msvc >= 2017  编译器使用utf-8编码
 msvc {
     greaterThan(QMAKE_MSC_VER, 1900){       # msvc编译器版本大于2015