I want to post my popular videos from another platforms like Youtube and Facebook in Pinterest. However the videos contain music by Facebook and Youtube. I am not sure if this music will work in Pinterest and will not raise a copyright issue.
Can you suggest shall I use this Youtube and facebook music in my videos uploaded in Pinterest?
Your goal is to get more website traffic so sharing your YouTube and FB content will not help you accomplish that goal. It's best that you create a blog post and embed your video content on your blog, then create a Pinterest image that will lead back to that blog post. It's your content so you should not be concerned about copyright.