Help with custom media embed BBCode

[themago]

User pastes:

https://myvideowebsite.com/VideoID/videofile.mp4

Output should be:

<iframe src="https://myvideowebsite.com/video/embed/VideoID/640x320/videofile.mp4" frameborder="0" scrolling="no" style="width: 640px; height: 320px; overflow: hidden;" allowfullscreen></iframe>

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Trying to configure this in the custom media bbcode is over my head, can anyone help with the settings/regex I should be using?
Help with custom media embed BBCode

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