Install mjpg-streamer

mkdir /mnt/sda1/pic
nano /etc/init.d/mjpg-streamer  
...
        --output "output_http.so --www $www --port $port" \
		--output "output_file.so -f /mnt/sda1/pic -d 10000"
}
...
/etc/init.d/mjpg-streamer restart

"-d 10000" means every 10 seconds save file.

access video via browser from http://arduino.local:8080

root@Arduino:/mnt/sda1/pic# ls /mnt/sda1/pic/*
/mnt/sda1/pic/2015_06_13_06_48_25_picture_000000000.jpg
/mnt/sda1/pic/2015_06_13_06_48_35_picture_000000001.jpg
/mnt/sda1/pic/2015_06_13_06_48_45_picture_000000002.jpg
...