Specifically, it is to add background music after shooting the video, which belongs to the category of mechanical performance. According to the law, if a published work is performed free of charge, and the performance does not charge the public or pay remuneration to the performer, it belongs to the fair use of the work, and the copyright owner can be exempted from licensing and paying remuneration. However, the name of the author and the title of the work shall be clearly stated, and other rights enjoyed by the copyright owner in accordance with this Law shall not be infringed.

Therefore, the video and public release after adding background music are free and do not constitute infringement. However, if there are fees, or if fees are charged directly or indirectly by publishing paid advertisements, it is an infringement and requires legal responsibility for infringing intellectual property rights.