opacity property
A percentage that indicates how much you want a watermark to obscure the
video in the location where it appears. Valid values are 0 (the watermark is
invisible) to 100 (the watermark completely obscures the video in the
specified location). The datatype of Opacity is float.
Elastic Transcoder supports transparent .png graphics. If you use a
transparent .png, the transparent portion of the video appears as if you had
specified a value of 0 for Opacity. The .jpg file format
doesn't support transparency.
Implementation
final String? opacity;