From Stephan Huber, OSX and iOS Video support via a QTKit plugin from OSX 10.7 and before, and an AVFoundation plugin for iOS and OSX10.8 and later.

CMakeModules/FindAVFoundation.cmake

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+# Locate Apple AVFoundation (next-generation QTKit)
+# This module defines
+# AV_FOUNDATION_LIBRARY
+# AV_FOUNDATION_FOUND, if false, do not try to link to gdal 
+# AV_FOUNDATION_INCLUDE_DIR, where to find the headers
+#
+# $AV_FOUNDATION_DIR is an environment variable that would
+# correspond to the ./configure --prefix=$AV_FOUNDATION_DIR
+#
+# Created by Stephan Maximilian Huber 
+
+# QTKit on OS X looks different than QTKit for Windows,
+# so I am going to case the two.
+
+IF(APPLE)
+  FIND_PATH(AV_FOUNDATION_INCLUDE_DIR AVFoundation/AVFoundation.h)
+  FIND_LIBRARY(AV_FOUNDATION_LIBRARY AVFoundation)
+ENDIF()
+
+SET(AV_FOUNDATION_FOUND "NO")
+IF(AV_FOUNDATION_LIBRARY AND AV_FOUNDATION_INCLUDE_DIR)
+  SET(AV_FOUNDATION_FOUND "YES")
+ENDIF()
+
+IF(OSG_BUILD_PLATFORM_IPHONE OR OSG_BUILD_PLATFORM_IPHONE_SIMULATOR)
+    # TODO, AVFoundation exists ON iOS, too
+    SET(AV_FOUNDATION_FOUND "NO")
+ENDIF()
+
+IF(APPLE)
+    # AVFoundation exists since 10.7, but only 10.8 has all features necessary for OSG
+    # so check the SDK-setting
+
+    IF(${OSG_OSX_SDK_NAME} STREQUAL "macosx10.8")
+        # nothing special here ;-)
+    ELSE()
+        MESSAGE("AVFoundation disabled for SDK < 10.8")
+        SET(AV_FOUNDATION_FOUND "NO")  
+    ENDIF()
+ENDIF()
+

CMakeModules/FindCoreMedia.cmake

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+# Locate Apple CoreMedia
+# This module defines
+# COREMEDIA_LIBRARY
+# COREMEDIA_FOUND, if false, do not try to link to gdal 
+# COREMEDIA_INCLUDE_DIR, where to find the headers
+#
+# $COREMEDIA_DIR is an environment variable that would
+# correspond to the ./configure --prefix=$COREMEDIA_DIR
+#
+# Created by Stephan Maximilian Huber. 
+
+
+IF(APPLE)
+  FIND_PATH(COREMEDIA_INCLUDE_DIR CoreMedia/CoreMedia.h)
+  FIND_LIBRARY(COREMEDIA_LIBRARY CoreMedia)
+ENDIF()
+
+
+SET(COREMEDIA_FOUND "NO")
+IF(COREMEDIA_LIBRARY AND COREMEDIA_INCLUDE_DIR)
+  SET(COREMEDIA_FOUND "YES")
+ENDIF()
+

CMakeModules/FindQuartzCore.cmake

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+# Locate Apple QuartzCore
+# This module defines
+# QUARTZCORE_LIBRARY
+# QUARTZCORE_FOUND, if false, do not try to link to QUARTZCORE 
+# QUARTZCORE_INCLUDE_DIR, where to find the headers
+#
+# $QUARTZCORE_DIR is an environment variable that would
+# correspond to the ./configure --prefix=$QUARTZCORE_DIR
+#
+# Created by Stephan Maximilian Huber. 
+
+
+IF(APPLE)
+  FIND_PATH(QUARTZCORE_INCLUDE_DIR QuartzCore/QuartzCore.h)
+  FIND_LIBRARY(QUARTZCORE_LIBRARY QuartzCore)
+ENDIF()
+
+
+SET(QUARTZCORE_FOUND "NO")
+IF(QUARTZCORE_LIBRARY AND QUARTZCORE_INCLUDE_DIR)
+  SET(QUARTZCORE_FOUND "YES")
+ENDIF()
+