Update app.py

app.py

@@ -63,7 +63,7 @@ def inference_video(video, size):
     _id = randint(1, 10000)
     INPUT_DIR = "tmp/" + str(_id)
     os.system("rm -rf " + INPUT_DIR)
-    os.system("mkdir -p" + INPUT_DIR)
+    os.system("mkdir -p " + INPUT_DIR)
     os.system(f"cd {INPUT_DIR}")
     upload_folder = 'upload'
     result_folder = 'results'