Is there a limit too how much internet video's that I can view each monthin
That's a bit of a difficult question to answer, since your overall data usage is measured but which applications or services use that data aren't. There are third-party solutions for monitoring your data more specifically to see which applications might be using the most data, but you can also just keep an eye on your usage through the My Account service to see how much you're using per month.
That said, you can make some estimates. For example, if you mostly use Netflix to stream video, they have some information which tells you how much data you can expect to use for various quality levels (link: https://help.netflix.com/en/node/87). I'd say that information is a fair comparison to most other video streaming services like Youtube or Vimeo.
Hope this helps.
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