GreenScreen: add process test

GitLab: https://git.jami.net/savoirfairelinux/jami-daemon/-/issues/745

Change-Id: Iad3ce60555f8cff81b3e0b49bfc4fc164e2bbb37
diff --git a/GreenScreen/testPreferences.yml b/GreenScreen/testPreferences.yml
new file mode 100644
index 0000000..32a64ab
--- /dev/null
+++ b/GreenScreen/testPreferences.yml
@@ -0,0 +1,6 @@
+background: "backgrounds/background2.jpeg"
+blur: "0"
+blurlevel: "8"
+streamslist: "out"
+sample: "sample.mp4"
+output: "processed.mp4"
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