DLC make_video minor fixes (#1150)

* Pass output file name as str

* Update changelog

Author: CBroz1

CHANGELOG.md

@@ -53,6 +53,7 @@ dj.FreeTable(dj.conn(), "common_session.session_group").drop()
     - Fix video directory bug in `DLCPoseEstimationSelection` #1103
     - Restore #973, allow DLC without position tracking #1100
     - Minor fix to `DLCCentroid` make function order #1112, #1148
+    - Pass output path as string to `cv2.VideoWriter` #1150
 
 - Spike Sorting
 

src/spyglass/position/v1/dlc_utils_makevid.py

@@ -134,7 +134,7 @@ def _init_video(self):
     def _init_cv_video(self):
         _ = self._init_video()
         self.out = cv2.VideoWriter(
-            filename=self.output_video_filename,
+            filename=str(self.output_video_filename),
             fourcc=cv2.VideoWriter_fourcc(*"mp4v"),
             fps=self.frame_rate,
             frameSize=self.frame_size,