Start addressing gstreamer deps on macos ci build

.ci/macos/Brewfile

 tap "nlohmann/json"
 
+brew "pkg-config"
 brew "clang-format"
 brew "cmake"
 brew "ninja"
 brew "openssl"
 brew "qt5"
 brew "python3"
-brew "nlohmann_json"
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+brew "nlohmann_json"
+brew "gstreamer"
+brew "gst-plugins-base"
+brew "gst-plugins-good"
+brew "gst-plugins-bad"
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