As a Muslim, is it allowed to pray on stream if you are a streamer?
Yes, why shouldn't you be allowed to?
The only question is clearly why you should do that
If it's a dua, you can certainly say amin and pray with me.
But if you mean the Salah / Namaz, i.e. The ritual prayer: no, you can't join his prayer.
You must be in the same place for you to join his prayer.
YES, because - if you live in D, which I suspect - then you are allowed to, because you live in a FREE and not in a Muslim country.