We'd like to help. To delete a video you need to login into the account first. Also, to recover an account, you'll need to have at least one of the account related info(i.e email/username & any recovery options). Here's how you can do it: https://goo.gl/bqDUzi
We understand your concern. Please note that we will not be able to access any user account related information from our end due to security reasons. You'll need to have at least one of your account related info to recover it as informed in the above tweet. Hope this clarifies!