Add custom metadata fields for DAM assets in a particular folder

Hi All

   I created custom metadata fields for video DAM Assets in AEM 6.0 .As described in the AEM documentation, these changed fields are available for ALL video assets in the DAM.

I need these metadata fields to be made available to only a specific folder, e.g /content/dam/MYPATH instead of every asset.

Any suggestions how we can achieve this?

Thanks

Dipti