As a general rule, the position of the ball in relation to the goal line is always reviewable by instant replay.
Dead Ball and Loose Ball
ARTICLE 3.Reviewable plays involving potential dead balls and loose balls include:
d. Loose ball ruled dead (Rule 4-1-2b-2), or live ball ruled dead in possession of a ball carrier, when the clear recovery of a loose ball occurs in the immediate continuing football action.
1. If the ball is ruled dead and the replay official does not have indisputable video evidence as to which team recovers or confirmation of the recovery by the officials on the field, the dead-ball ruling stands.
2. If the replay official rules that the ball was not dead, it belongs to the recovering team at the spot of the recovery and any advance is nullified.