add private module to create model object for movement api

opendbm/api_lib/movement/_head_movement.py

@@ -0,0 +1,19 @@
+import tempfile
+
+from opendbm.api_lib.model import VideoModel
+from opendbm.dbm_lib import run_head_movement
+
+
+class HeadMovement(VideoModel):
+    def __init__(self):
+        super().__init__()
+        self._params = [
+            "mov_headvel",
+            "mov_hposepitch",
+            "mov_hposeyaw",
+            "mov_hposeroll",
+            "mov_hposedist",
+        ]
+
+    def _fit_transform(self, path):
+        return run_head_movement(path, f"{tempfile.gettempdir()}/", self.r_config)