You could use your android device to record your cube and screen capture software to record the timer, then edit them together.
The alternative is using a camera angle that shows the cube and monitor in the same view, but make sure the timer text is large enough to see the time in the video.
I bought a 10 dollar tripod that was made for phones (might be 6 dollars idk). But I would try experimenting with trying to set up the camera with items in your house to prop it up first like what was said above.