can i power esp32 cam using 4aaa batteries connected in series which results in 6v which passes down to ams 1117 regulator(external) which gives 5v output?. Also can it be powered using 5v output pin of l293d motor shield . The cam continuously transfers live video data over wifi. Plus will be on 5v pin or vcc pin
Esp32 cam model : HW-818
Regulator has Vin-Vout 1.1V, so 6V is not enough, you could use 5x AAA for 7.5V. Even better would be step down converter.
Does it have 5V output? What datasheet says?
What that means?
The '5V' pin on the ESP32CAM feeds the input of an AMS1117 3.3V regulator. That needs about 4.4V input to provide the 3.3V.
Unfortunatly most so called '1.5V' batteries are only 1.5V when brand new. Alkalines will be down to 1.2V half way through their life, so 3 of thme would only be providing you with 3.6V to feed the regulator, not enough.
You can use 3 x NiZn rechargeables, they will be close to 1.5V for most of their life as will the non-rechargeable AA and AAA Lithium energizers.
Usually most boards have a power pin named vcc in power is supplied. But in my esp32 cam {HW-818} there are two pins 5v and vcc. So should i power them with 5v to vcc or to 5v pin. Also my l293d motor shield indeed has many 5v pins and corresponding ground pins
NiZn batteries are expensive in my country. Cost factor is important for me. Also I wanted to know if I am supplying 12v to the motor shield will they provide enough power for the esp32 cam to run and perform the necessary functions?
Answer: 5V
These boards can have whatever labeling. I expect Vcc to be 3.3V, but I have seen esp board where Vcc was 5V pin. Also 5V could/should be labeled VIN.
Notice that @srnet answer was for powering directly to 5V pin, your question was for using additional 5V Ams1117.
If your motor supply is solid 12V, you could use buck converter to step it down to 5V for espcam
No the l293d motor shield has inbuilt 5v pins
Image: https://cdn.shopify.com/s/files/1/0559/1970/6265/files/14_480x480.png?v=1681196374
I am asking about the pins marked as 5v in the given image
I don't know your specific shield, mut generally motor drivers have motor supply and separated 5V control circuit. So the 5V is input, not output.
No it is 5v output cause i just tried running a nodemcu blink led code and it works I was just asking whether can it provide sufficient current for esp32 cam
Make me understand.. So you are powering 12V to motor supply, and that shield is giving you 5V output on 5Vpin?
yes
Ok, then your shield has already voltage converter built in. Maybe for servo purposes..? Quite uncommon driver circuit. I would expect current being sufficient to power esp32 as well.
But how are you facing the fact that your control signal from esp32 is 3.3V?
My esp32 cam has a built in ams 1117 regulator and I am planning to supply 5v from the 5v pin on shield Also there are separate pins for powering and managing servos
And that's fine but how are you thinking to control the motors if your shield expects 5V control signal? Esp32 can be powered from 5V, but it's definetly 3V3 device.
I think you should look for datasheet of your specific shield.
Shield sits on top of arduino
Small detail you forgot to mention..? 
yup!
Which Arduino?
Some Arduinos won't be able to supply enough current for the ESP32cam
I tried plugging esp32 cam this time with l293d motor shield and it worked, dont know how. Also a clone arduino uno is used here