How do i stop the parents complaints?

Most usually it is best to consult parents on any kind of video such as this BEFORE hand to ensure this doesn't happen. But since the first step was not put forth I suggest writing a formal letter to the parents apologizing. A video such as the one described can put a lot of fear into children and may not have been a wise choice from you. Not only do the children look up to you as a teacher but the parents put their faith in you to enstill their children with the utmost of care. This incident probably showed a lack of care in their eyes and they wont be satisfied until an apology has been made. Not to mention, I'm not so sure that you should be teaching at all if your grammer is as awful as you portrayed above and your decription of dogs as wolves.