add
Add a source to the sourceSet property of the given block. If there already exists in source set a video with the same width, that existing video will be replaced. If the source set is or gets empty, the crop and content fill mode of the associated block will be set to the default values. Note: This fetches the resource from the given URI to obtain the video dimensions. It is recommended to use setSourceSet if the dimension is known.
Parameters
block
the block to update.
property
the name of the property to modify.
uri
the source to add to the source set.