A group of people from a particular family are born with an ability to see into the past. They would like to exploit this for money but there is no obvious way to do so.
By closing their eyes and by an act of will they can see, hear, feel, taste smell in perfect detail anything that happened to them up to about 1 hour ago. They can run it forward and backwards at any speed.
This could have amazing benefits for the individual doing it (the least of which is remembering where you put your keys). However the commercial value to others is not obvious.
I can see many ways that this could be useful to the person themself. However I believe that there is absolutely no useful way that they could sell this ability to another person or organisation as all the memories are their own. Am I right?
This is not time travel. Being taken to a crime scene and being asked to say what happened 1 hour before won't work, unless of course they were already at the crime scene. Otherwise they will just remember being brought there, too late to witness anything.
None of their other abilities are adversely affected by the talent unlike for some savants.
It's effectively raw input so they can apply a different thought process to it the second (and subsequent ) times around. Of course it only goes back 1 hr so they will progressively lose the tail end of it.
While they are recalling, they are unable to observe the present. They can describe what they are experiencing.
From a computing perspective your superpower is a 1 hour FIFO buffer.