Huh what u talking about to what end?Is it possible to install an HDMI mod into the Gamepad? So i can plug it on another screen when WiiU's TV is used?
Is it possible to install an HDMI mod into the Gamepad? So i can plug it on another screen when WiiU's TV is used?

It's call nintendo switchIs it possible to install an HDMI mod into the Gamepad? So i can plug it on another screen when WiiU's TV is used?

You just plug your wii u main unit to the other TV or use the game pad. The game pad has not enough battery or processing power to emit playable HDMI 720p/1080p.

Well you still have to move the receiver from one tv to another or at least push a button there or on a remote for the transmitter to connect to another receiver...Clarification: Many games offer an Off-TV Play mode where the Gamepad gets the main content rather than map, inventory &c., so you don't need access to the TV. There is a homebrew program (SwapDRC) that will force this on any Wii U game.
If you really want to connect the Wii U to another TV without doing the easy thing, as Urbanshadow points out, of actually moving the console, you can get HDMI transmitters & receivers. But these would be connected to the HDMI port on the back of the console, not added to the Gamepad.
It could do 480p though, but the efficacy would be... limited. A better approach would be to build some kind of Aroma plugin to assist in letting a compatible PC Wi-Fi card sniff the Wii U-DRC connection and output the same audio/video feed.The game pad has not enough battery or processing power to emit playable HDMI 720p/1080p.

At that point you could supplant the whole gamepad by the PC as well, not that it matters much anyway since a regular TV/Smart TV wouldn't be able to do that on it's own (without the PC) and it's still easier to connect the main unit to the TV than is to do any of this.It could do 480p though, but the efficacy would be... limited. A better approach would be to build some kind of Aroma plugin to assist in letting a compatible PC Wi-Fi card sniff the Wii U-DRC connection and output the same audio/video feed.