add some comments to the sample config

config/config.yml

@@ -15,8 +15,28 @@ cameras:
       # values that begin with a "$" will be replaced with environment variable
       password: $RTSP_PASSWORD
       path: /cam/realmonitor?channel=1&subtype=2
+    # Optional mask. Must be the same dimensions as your video feed.
+    # The mask works by looking at the bottom center of the bounding box for the detected
+    # person in the image. If that pixel in the mask is a black pixel, it ignores it as a
+    # false positive. In my mask, the grass and driveway visible from my backdoor camera 
+    # are white. The garage doors, sky, and trees (anywhere it would be impossible for a 
+    # person to stand) are black.
     mask: back-mask.bmp
+    # Allows you to limit the framerate within frigate for cameras that do not support
+    # custom framerates. A value of 1 tells frigate to look at every frame, 2 every 2nd frame, 
+    # 3 every 3rd frame, etc.
     take_frame: 1
+    # Optional hardware acceleration parameters for ffmpeg. If your hardware supports it, it can
+    # greatly reduce the CPU power used to decode the video stream. You will need to determine which
+    # parameters work for your specific hardware. These may work for those with Intel hardware that
+    # supports QuickSync.
+    ffmpeg_hwaccel_args:
+      - -hwaccel
+      - vaapi
+      - -hwaccel_device
+      - /dev/dri/renderD128
+      - -hwaccel_output_format
+      - yuv420p
     regions:
       - size: 350
         x_offset: 0