Please help please :'(?

if you really think that they have kidnapped that girl then tell this to cops. If the video is online is online or they were chating then it will not be problem for cops to catch them. Servers always have records of chating and other information for long time and with that information cops can trace there location. So if you doubt tell the cops even if you think it may not be true even then explain it to cops and you will be fine....