use study link embedded in the same window of amazon mturk (iframe)

Hello, I am trying to create a study that opens in the mturk webpage instead of a new window. In the study we are using webcam and I got this message when publish the study in sandbox (so I could try it out). Warning message says: Unable to connect to your webcam, please try again. Perhaps it is being used by another application. So what should I edit in the HTML format so I can give access to webcam using the same page? Is that the solution or should I try to search something else?