There is still the second leg that will be happening in camp no, real madrid is still possible to surpass it and winning the match against barcelona. The own goal that already made by militao was a very bad mistake by him. That was making real madrid loses its confidence to win against barcelona in the santiago bernabeu. The next match gonna happen in camp nou. Real can come back anytime soon. I think that if militao didn't make mistake like that and the result gonna be draw.
It's very good to see that real madrid has not yet lose its chance to win against barcelona caused by second leg is still available.
The second Leg will hold in Camp Nou as rightly stated. It might be difficult for Madrid to surpass Barcelona in their home stadium. Al though the real victor for the Copa del Rey semi-final between this two rivals is not conclusive yet because Madrid can still turn things around but the fact the second leg will hold in Camp Nou makes Barcelona more advantageous than Madrid.