First backup fstab with
just in case.
sudo cp /etc/fstab /etc/fstabbak
I am assuming the lines
in your current fstab are those for the partition, now ntfs, that you want to mount automatically at boot.
#Entry for /dev/sda5 :
UUID=b64e6e57-9c6e-4931-a3dd-d5dec9aece1c /media/Video ext4 defaults 0 2
Edit those lines to
Save the file and then run If there is no error message, the partition will be mounted and all should be OK at next boot.
#Entry for /dev/sda5
UUID=249ED17813DAC901 /media/Video/ ntfs-3g auto,user,rw 0 0