How can i see through my hp laptop integrated webcam using my smartphone?

I think one of my roommates might be sneaking in my room while I'm not there, but I can't prove it! And if its not him I don't want to wrongfully accuse him either! I know I should just buy a video camera, but I can't right now. Just being able to see it through my phone is enough proof for me. Can anyone walk me through what I need to do to allow myself access and any other helpful tips?