No, there's actually no potential for AW to overtake GTA V in overall sales. GTA V has so far accumulated 34+ million units sold, and it's releasing on PS4/Xbox One/PC soon, which will quickly take it past 40 million in sales, and then 50 million isn't beyond the realm of possibility. GTA V took the number six spot of best-selling games of all-time in less than a year.
The best-selling CoD titles is Modern Warfare 2 with 28.5 million units sold. A handful of other CoD titles hit above 20 million units sold, but Ghosts fell short with 19 million copies. Advanced Warfare could possibly (unlikely) reach 30 million in sales, but it's going nowhere near 40 million and especially not near 50 million that GTA V will likely eclipse.