Why does the Xiaomi Outdoor Camera BW500 have low sensitivity to human detection and fail to capture people?

You can customize the settings in the Mi Home APP to adjust the sensitivity.
For your reference, here is more information about the sensitivity:
1. High sensitivity covers about 7 meters. Medium sensitivity covers about 5 meters. Low sensitivity covers about 3 meters;
2. The Xiaomi Outdoor Camera BW500 will detect again after recording the alarm video at an interval. To reduce the frequency of video push (to prevent interruption), you can also select different intervals;
3. The interval is mainly because the camera uses lithium batteries as an energy supply. It can be used for a longer time after a single charge, and it can also meet basic security needs.