remove top hose pipe from radiator when car is hot and pressure empty the radiator & engine water channels. (use air blower on mouth of radiator)
fix the hose back & tight properly, fill the coolant start the engine & slowly top up. fill up the reservoir and wait for cooling fans to come in action. drive around & observe the temp come back on forum with input.
next time try to make video in sun light or with a flash light. I don't know about others but to me the video is nothing but a dark horror scene wth some machine noise.