JobWatermark 
    class JobWatermark
Watermarks can be in .png or .jpg format. If you want to display a watermark that is not rectangular, use the .png format, which supports transparency.
Types
Properties
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                  The encryption settings, if any, that you want Elastic Transcoder to apply to your watermarks.
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                  The ID of the watermark settings that Elastic Transcoder uses to add watermarks to the video during transcoding. The settings are in the preset specified by Preset for the current output. In that preset, the value of Watermarks Id tells Elastic Transcoder which settings to use.