Can I stream video from my iphone to my ipad ?

No.

As both your iPad and iPhone are largely able to install and run exactly the same Apps, just use the same App to stream content on whichever device is needed.

There are many reasons that you might encounter difficulties. Here are some of the possibilities:

• Some App Developers may only release an App for one or other platform.
• Older Apps, if no longer maintained by the Developer, may be completely withdrawn from the App Store.
• Your iPad may be an older model device, for which a compatible version of an App is not available.