https://stackoverflow.com/questions/21736803
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RussianYoutube's migration document lists the following alternative:
Set or retrieve developer tags – The v2 API supported the ability to associate keywords, or developer tags, with a video at the time that the video was uploaded. Developer tags would not be displayed to YouTube users, but video owners could retrieve videos that matched a specific developer tag. The v3 API's search.list method supports a similar, but not identical, feature with its forDeveloper filter parameter, which restricts a search to only retrieve videos uploaded via the developer's application or website. The forDeveloper parameter can be used in conjunction with optional search parameters like the q parameter. For this feature, each uploaded video is automatically tagged with the project number that is associated with the developer's application in the Google Developers Console. When a search request subsequently sets the forDeveloper parameter to true, the API server uses the request's authorization credentials to identify the developer. Therefore, a developer can restrict results to videos uploaded through the developer's own app or website but not to videos uploaded through other apps or sites.
ref: https://developers.google.com/youtube/v3/migration-guide#deprecated
