Video answer: Copyright permissions - copyright on youtube
Top best answers to the question «Do you need permission to publish photo of someone»
Requirements for Publishing Images
Anyone is allowed to take photos of anyone or anything in a public space. If the photo is for personal enjoyment, nothing else is required — you don't need a model release form or permission… Publish means that the photo will be used for promotional purposes.
Video answer: Copyright and youtube: how you can use someone else’s video on your channel