There is an unresolved question in physics regarding the behaviour of an electric charge in a gravitational field. One argument considers gravitation as a force, which leads to the application of the Larmor formula, the other one considers Einsteins point of view and uses the equivalence principle. The answers are quite different. Unfortunately this cannot be resolved by an experiment because the possible expected radiation power in the gravitational field of the earth would be extremly tiny.
Not covered in the video: First attempts to resolve this question can be traced back to Max Born (1909). A closer look might reveal the occurence of a paradox by the equivalence principle itself.