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The GoPro HERO5 Black supports USB Power Delivery over its USB Type-C connector which means you can use Android phones like the Samsung Galaxy S8 as a power bank (assuming you don't mind sacrificing your phone's battery charge to get more video recording time).

Here we connect a USB Type-C to Type-C cable between the GoPro HERO5 Black and the Samsung Galaxy S8 when the phone is fully charged but the GoPro HERO5 Black's battery is fully depleted. Under the phone's USB charging options, we select 'Charge connected device'.

  

  

Initially, we see that the Samsung Galaxy S8 is constantly advertising its power capabilities of 4.5 watts (5 volts @ 0.9 amps).

We then observe that the GoPro HERO5 Black requests 4.5 watts (5 volts @ 0.9 amps) from the Samsung Galaxy S8.

The GoPro HERO5 Black also advertises its power sink capabilities of 4.5 watts (5 volts @ 0.9 amps) and 8.25 watts (5.5 volts @ 1.5 amps).

However, after the power contract is established, we find that a hard reset happens and the GoPro HERO5 Black and Samsung Galaxy S8  again repeat the same USB Power delivery protocol negotiation with the same power contract established.

In fact, we have observed that the GoPro HERO5 Black is being charged by pulling around 2.5 watts (5 volts @ 0.5 amps), in which the Samsung Galaxy S8's battery was depleted from 100% to 80% and the GoPro HERO5 Black was charged from 0% to 15%.

We can say that the GoPro HERO5 Black can be charged over its USB Type-C connector using Android phones like the Samsung Galaxy S8 as a power bank