OKay lets first use some pliers and see if we can grab a hold of the cable and pull it. Do this while a helper smacks the hood with the palms of there hands to aid in the release disconnecting. If this fails then you will need to go through the grill and try and get to the cable to pull it there or cut it there and pull the wire inside the cable there. if this fails then try to go through the grill and remove the bolts from the latch or striker. Sometimes you must sacrfice the grill to gain access especailly if you cant get your hands in. Other than that there is no other less destructive methods.
Define destruction= I have customers come in which took grinders to there hood and cut a hole where the latch is, Ouch.