It does not have to have a perverse reason, it can simply be as a memory of a conversation with that person that we only see once a year, or to perpetuate a bet that cannot be forgotten, or even for a job interview. Thus, we will show how to record video calls.
Are these recordings allowed?
It is a delicate matter to record calls and save conversations. There are several cases that can occur and that differ with respect to their legality, since everything lies in whether we are part of the conversation or not. We recall that according to article 18.3 of the Constitution, you can only record a conversation if you are part of it, so third parties are not allowed, unless he is a duly authorized agent of the State Corps. As long as we fulfill that premise, there are no legal problems to record video calls.
That is, as long as they are not made public or broadcast on the network, which is only for personal use, as we have discussed a few lines above. In the case of not complying with this condition, you would also be breaching article 2 of the Organic Law on Data Protection.
Anyway, and as things can be done better, it is advising the other party that we are going to do it, so that we do not have any problems.
How to record video calls
Many applications do not allow the recording of the video call from the mobile (which is more common from a PC), at least for now. Therefore, we must resort to an external alternative to achieve our purpose, always with the aim that it requires little time and is free, something that our pockets appreciate.
As of today, the only thing going on Android is to directly record what happens on the smartphone screen. For this, there are many options to choose from in the Play Store, but to carry out this tutorial, we have to choose one. The chosen one is AZ Screen Recorder, but there are many more that offer similar functions.
Before making the video call, we make sure that the app captures both the video and the audio of the conversation. For this, we open the recorder, although only a floating icon appears that we can move anywhere on the screen. If we click on it, a drop-down will be shown with various options, selecting the gear sign, referring to the Settings menu. From there, we make sure that Record Audio option is activated. 
Once verified, and with the same floating icon, we will record the video call. Before starting it, or during it, click on the icon of a miniature camcorder, the app will ask us if we are sure, click on Start now and automatically start a countdown. There is nothing else to do, we can only edit the recording a posteriori, to add effects or remove elements that we do not want to appear in the video.
