Video [Q] need apps to watch camera from other Android phone

hi , i need a simple and lite app to view the camera through other phone

why i need this ??

well for installing satellite sometimes i need to see the TV screen ( to get the best signal for canal) so i think it will be great if i put one phone Opposite of TV

the go to roof and watch with other phone what happens on TV !!

I try Video chat with LINE , Wechats , ... but it disconnect and heavy specially with slow connection

is there any app to do this ?? make 2 phones act like Video wakitaki