North Yorkshire Police said the offence took place at around 2.30pm on Saturday, November 3.
Anyone who recognises the man in the CCTV or who has any other information about the offence is urged to contact officers.
Email [email protected] or call 101, select option 2 and ask for David Gasson.
Alternatively, information can be passed on anonymously via the independent charity Crimestoppers on 0800 555 111.
Please quote reference 12180205931 when providing information.