fixed video player on chrome

src/hub/settings/base.py

@@ -112,7 +112,7 @@ env = environ.FileAwareEnv(
     CSP_FONT_SRC=(list, ["'self'"]),
     CSP_OBJECT_SRC=(list, ["'none'"]),
     CSP_FRAME_SRC=(list, ["'none'"]),
-    CSP_MEDIA_SRC=(list, ["'self'"]),
+    CSP_MEDIA_SRC=(list, ["'self'", 'blob:']),
     CSP_FRAME_ANCESTORS=(list, ["'none'"]),
     CSP_FORM_ACTION=(list, ["'self'"]),
     CSP_BASE_URI=(list, ["'self'"]),