'There is still hope' says Bring Back Our Girls campaigner

More than 200 schoolgirls were abducted by Boko Haram in Nigeria in April. The kidnapping sparked international outrage and a social media support campaign quickly spread around the world.

But the media focus has since shifted elsewhere.

HARDtalk speaks to Obiageli Ezekwesili, a former Nigerian minister and one of the leaders of the Bring Back our Girls campaign. She tells Stephen Sackur that despite the pain, there is still hope.