You need to have the FilterCodes plugin (or Generico filter) to do this.
With Filtercodes, it would be
{ifincohort CohortID|idnumber}
Content
{/ifincohort}
which will display enclosed content only if user is a member of the specified cohort. You can specify the Cohort ID in your cohort settings or its ID number. Cohort ID can contain a combination of letters from a to z, A to Z, numbers 0 to 9 and underscores. It will not work if it contains spaces, dashes or other special characters.
so in your case…
{ifincohort 15}
Documentary|http://localhost…
{/ifincohort}